diff --git a/initialize/migrate/database/02157_lottery_grant_ledger.down.sql b/initialize/migrate/database/02157_lottery_grant_ledger.down.sql
new file mode 100644
index 0000000..49b0331
--- /dev/null
+++ b/initialize/migrate/database/02157_lottery_grant_ledger.down.sql
@@ -0,0 +1,2 @@
+-- 02157 抽奖发奖账本回滚
+DROP TABLE IF EXISTS `lottery_grant_ledger`;
diff --git a/initialize/migrate/database/02157_lottery_grant_ledger.up.sql b/initialize/migrate/database/02157_lottery_grant_ledger.up.sql
new file mode 100644
index 0000000..134de5e
--- /dev/null
+++ b/initialize/migrate/database/02157_lottery_grant_ledger.up.sql
@@ -0,0 +1,25 @@
+-- 02157 抽奖发奖账本（PR B）
+--
+-- 目的：以 external_ref 作为 DB 层唯一键，做每个 draw 的发奖幂等。
+-- 各 PrizeHandler.Dispatch 内先 SELECT/INSERT lottery_grant_ledger，命中即幂等返回，
+-- 未命中再调下游发放（UpdateSubscribe / UpdateCommission + WriteCommissionLog），
+-- 全部在同一 tx 内完成 → 抽奖事务与发奖账本同生共死。
+--
+-- 关键唯一索引：external_ref。惯例值 = "lottery:{activity_id}:{draw_id}"。
+-- handler_type：与 lottery_prize.type 一致（vpn_duration / commission / …），用于统计。
+
+CREATE TABLE IF NOT EXISTS `lottery_grant_ledger` (
+  `id`             BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
+  `external_ref`   VARCHAR(128)    NOT NULL              COMMENT '幂等键：lottery:{activity_id}:{draw_id}',
+  `handler_type`   VARCHAR(32)     NOT NULL              COMMENT 'handler 类型，与 lottery_prize.type 对齐',
+  `user_id`        BIGINT UNSIGNED NOT NULL              COMMENT '发放对象用户 ID（家庭组已归位到 owner）',
+  `activity_id`    BIGINT UNSIGNED NOT NULL              COMMENT '活动 ID',
+  `draw_id`        BIGINT UNSIGNED NOT NULL              COMMENT '抽奖记录 ID',
+  `amount`         BIGINT          NOT NULL DEFAULT 0    COMMENT '发放数量（天/佣金金额，单位与 handler 一致）',
+  `payload`        JSON                                    COMMENT '发放后的关键结果快照（订阅 ID、佣金前后余额等）',
+  `granted_at`     DATETIME        NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '发放完成时间',
+  PRIMARY KEY (`id`),
+  UNIQUE KEY `uk_external_ref` (`external_ref`),
+  KEY `idx_user_activity` (`user_id`, `activity_id`),
+  KEY `idx_draw_id` (`draw_id`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COMMENT='抽奖发奖账本（幂等键 = external_ref）';
diff --git a/internal/logic/lottery/handler/commission.go b/internal/logic/lottery/handler/commission.go
new file mode 100644
index 0000000..b23c476
--- /dev/null
+++ b/internal/logic/lottery/handler/commission.go
@@ -0,0 +1,127 @@
+package handler
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+
+	logmodel "github.com/perfect-panel/server/internal/model/log"
+	"github.com/perfect-panel/server/internal/model/lottery"
+	"gorm.io/gorm"
+)
+
+// CommissionHandler 发放"抽奖佣金"。写 user.commission 增量 + system_logs
+// (Type=Commission, CommissionType=339 Lottery) —— 用新增的 CommissionTypeLottery
+// 常量与 Purchase/Renewal 区分，账目侧对账更清晰。
+//
+// 幂等模型：DispatchRequest.IdempotencyKey → lottery_grant_ledger.external_ref。
+// Reserve 命中即幂等，未命中才走真实发放。commission 直接发给中奖者本人，不做
+// 家庭组归位（family owner 不代收成员的抽奖佣金）。
+type CommissionHandler struct {
+	deps CommissionDeps
+}
+
+// CommissionDeps 是 CommissionHandler 需要的最小依赖集。抽出到接口方便测试。
+type CommissionDeps struct {
+	Ledger lottery.LedgerService
+	// UpdateCommission 对齐 UserModel.UpdateCommission 签名。
+	UpdateCommission func(ctx context.Context, userId int64, delta int64, tx ...*gorm.DB) error
+	// WriteCommissionLog 对齐 common.WriteCommissionLog 签名。
+	WriteCommissionLog func(tx *gorm.DB, objectID int64, logType uint16, amount int64, orderNo string) error
+}
+
+// NewCommissionHandler 构造真实的 commission handler。
+func NewCommissionHandler(deps CommissionDeps) *CommissionHandler {
+	return &CommissionHandler{deps: deps}
+}
+
+func (*CommissionHandler) Type() string               { return lottery.PrizeTypeCommission }
+func (*CommissionHandler) IsAuto() bool               { return true }
+func (*CommissionHandler) ValidateClaim([]byte) error { return nil }
+
+type commissionConfig struct {
+	// AmountCents 是"分"级别的金额（与 user.commission 存储单位对齐）。
+	AmountCents int64 `json:"amount_cents"`
+}
+
+type commissionPayload struct {
+	Amount  int64  `json:"amount"`
+	LogType uint16 `json:"log_type"`
+	Message string `json:"message"`
+	OrderNo string `json:"order_no"`
+}
+
+// Dispatch 在 caller 的事务内为中奖人发放佣金。
+func (h *CommissionHandler) Dispatch(ctx context.Context, tx *gorm.DB, req lottery.DispatchRequest) (lottery.DispatchResult, error) {
+	if tx == nil {
+		return lottery.DispatchResult{}, errors.New("commission handler requires a transaction")
+	}
+	if req.IdempotencyKey == "" {
+		return lottery.DispatchResult{}, errors.New("commission handler requires DispatchRequest.IdempotencyKey")
+	}
+	if h.deps.UpdateCommission == nil || h.deps.WriteCommissionLog == nil {
+		return lottery.DispatchResult{}, errors.New("commission handler deps not fully wired")
+	}
+
+	var cfg commissionConfig
+	if err := json.Unmarshal([]byte(req.Prize.Config), &cfg); err != nil {
+		return lottery.DispatchResult{}, fmt.Errorf("decode commission config: %w", err)
+	}
+	if cfg.AmountCents <= 0 {
+		return lottery.DispatchResult{}, fmt.Errorf("commission config amount_cents must be > 0, got %d", cfg.AmountCents)
+	}
+
+	// 佣金"发给中奖者本人"（不走家庭组归位）。
+	targetUserID := req.UserId
+
+	entry := lottery.GrantLedger{
+		ExternalRef: req.IdempotencyKey,
+		HandlerType: lottery.PrizeTypeCommission,
+		UserId:      targetUserID,
+		ActivityId:  req.ActivityId,
+		DrawId:      req.DrawId,
+		Amount:      cfg.AmountCents,
+	}
+	row, alreadyExisted, err := h.deps.Ledger.Reserve(ctx, tx, entry)
+	if err != nil {
+		return lottery.DispatchResult{}, fmt.Errorf("reserve grant ledger: %w", err)
+	}
+	if alreadyExisted {
+		var payload commissionPayload
+		if row.Payload != "" {
+			_ = json.Unmarshal([]byte(row.Payload), &payload)
+		}
+		if payload.Message == "" {
+			payload.Message = "佣金已到账"
+		}
+		return lottery.DispatchResult{State: lottery.DispatchStateAutoClaimed, Message: payload.Message}, nil
+	}
+
+	// 未存在 → 真实发放。UpdateCommission 用 gorm.Expr 原子累加，避免丢更新。
+	if err := h.deps.UpdateCommission(ctx, targetUserID, cfg.AmountCents, tx); err != nil {
+		return lottery.DispatchResult{}, fmt.Errorf("update commission for user %d: %w", targetUserID, err)
+	}
+	// 传 external_ref 到 WriteCommissionLog 的 orderNo 位（"lottery:*"），与业务 order 命名域天然区分。
+	if err := h.deps.WriteCommissionLog(tx, targetUserID, logmodel.CommissionTypeLottery, cfg.AmountCents, req.IdempotencyKey); err != nil {
+		return lottery.DispatchResult{}, fmt.Errorf("write commission log: %w", err)
+	}
+
+	payload := commissionPayload{
+		Amount:  cfg.AmountCents,
+		LogType: logmodel.CommissionTypeLottery,
+		OrderNo: req.IdempotencyKey,
+		Message: fmt.Sprintf("佣金已到账 %d", cfg.AmountCents),
+	}
+	raw, err := json.Marshal(payload)
+	if err != nil {
+		return lottery.DispatchResult{}, fmt.Errorf("marshal ledger payload: %w", err)
+	}
+	if err := tx.WithContext(ctx).
+		Model(&lottery.GrantLedger{}).
+		Where("id = ?", row.Id).
+		UpdateColumn("payload", string(raw)).Error; err != nil {
+		return lottery.DispatchResult{}, fmt.Errorf("update ledger payload: %w", err)
+	}
+	return lottery.DispatchResult{State: lottery.DispatchStateAutoClaimed, Message: payload.Message}, nil
+}
diff --git a/internal/logic/lottery/handler/commission_test.go b/internal/logic/lottery/handler/commission_test.go
new file mode 100644
index 0000000..02842c3
--- /dev/null
+++ b/internal/logic/lottery/handler/commission_test.go
@@ -0,0 +1,185 @@
+package handler
+
+import (
+	"context"
+	"strings"
+	"testing"
+
+	logmodel "github.com/perfect-panel/server/internal/model/log"
+	"github.com/perfect-panel/server/internal/model/lottery"
+	"gorm.io/gorm"
+)
+
+func TestCommission_RequiresIdempotencyKey(t *testing.T) {
+	db, _, cleanup := newHandlerTestDB(t)
+	defer cleanup()
+
+	h := NewCommissionHandler(CommissionDeps{
+		Ledger: &fakeLedger{},
+		UpdateCommission: func(context.Context, int64, int64, ...*gorm.DB) error {
+			t.Fatal("must NOT call UpdateCommission without idempotency key")
+			return nil
+		},
+		WriteCommissionLog: func(*gorm.DB, int64, uint16, int64, string) error { return nil },
+	})
+	_, err := h.Dispatch(context.Background(), db, lottery.DispatchRequest{})
+	if err == nil || !strings.Contains(err.Error(), "IdempotencyKey") {
+		t.Fatalf("expected IdempotencyKey error, got %v", err)
+	}
+}
+
+func TestCommission_RequiresTx(t *testing.T) {
+	h := NewCommissionHandler(CommissionDeps{Ledger: &fakeLedger{}})
+	_, err := h.Dispatch(context.Background(), nil, lottery.DispatchRequest{IdempotencyKey: "k"})
+	if err == nil || !strings.Contains(err.Error(), "transaction") {
+		t.Fatalf("expected tx error, got %v", err)
+	}
+}
+
+func TestCommission_IdempotentHitDoesNotWrite(t *testing.T) {
+	db, _, cleanup := newHandlerTestDB(t)
+	defer cleanup()
+
+	ledger := &fakeLedger{
+		reserveFn: func(_ context.Context, _ *gorm.DB, _ lottery.GrantLedger) (*lottery.GrantLedger, bool, error) {
+			return &lottery.GrantLedger{
+				Payload: `{"message":"佣金已到账 300"}`,
+			}, true, nil
+		},
+	}
+	h := NewCommissionHandler(CommissionDeps{
+		Ledger: ledger,
+		UpdateCommission: func(context.Context, int64, int64, ...*gorm.DB) error {
+			t.Fatal("must NOT UpdateCommission on idempotent hit")
+			return nil
+		},
+		WriteCommissionLog: func(*gorm.DB, int64, uint16, int64, string) error {
+			t.Fatal("must NOT WriteCommissionLog on idempotent hit")
+			return nil
+		},
+	})
+
+	res, err := h.Dispatch(context.Background(), db, lottery.DispatchRequest{
+		UserId:         42,
+		Prize:          lottery.Prize{Config: `{"amount_cents":300}`},
+		IdempotencyKey: "lottery:100:200",
+	})
+	if err != nil {
+		t.Fatalf("Dispatch: %v", err)
+	}
+	if res.Message != "佣金已到账 300" {
+		t.Fatalf("expected replay message, got %q", res.Message)
+	}
+}
+
+func TestCommission_FirstTimeWritesCommissionAndLog(t *testing.T) {
+	db, mock, cleanup := newHandlerTestDB(t)
+	defer cleanup()
+
+	ledger := &fakeLedger{
+		reserveFn: func(_ context.Context, _ *gorm.DB, _ lottery.GrantLedger) (*lottery.GrantLedger, bool, error) {
+			return &lottery.GrantLedger{Id: 11}, false, nil
+		},
+	}
+
+	var (
+		updateCommissionCalled = false
+		writeLogCalled         = false
+		writeLogType           uint16
+		writeLogAmount         int64
+		writeLogOrderNo        string
+	)
+	h := NewCommissionHandler(CommissionDeps{
+		Ledger: ledger,
+		UpdateCommission: func(_ context.Context, uid, amount int64, _ ...*gorm.DB) error {
+			updateCommissionCalled = true
+			if uid != 42 || amount != 300 {
+				t.Fatalf("UpdateCommission got (uid=%d, amount=%d)", uid, amount)
+			}
+			return nil
+		},
+		WriteCommissionLog: func(_ *gorm.DB, objectID int64, logType uint16, amount int64, orderNo string) error {
+			writeLogCalled = true
+			writeLogType = logType
+			writeLogAmount = amount
+			writeLogOrderNo = orderNo
+			if objectID != 42 {
+				t.Fatalf("WriteCommissionLog objectID=%d, want 42", objectID)
+			}
+			return nil
+		},
+	})
+
+	mock.ExpectExec("UPDATE `lottery_grant_ledger`").
+		WillReturnResult(sqlmockAnyResult())
+
+	_, err := h.Dispatch(context.Background(), db, lottery.DispatchRequest{
+		UserId:         42,
+		ActivityId:     100,
+		DrawId:         200,
+		Prize:          lottery.Prize{Config: `{"amount_cents":300}`},
+		IdempotencyKey: "lottery:100:200",
+	})
+	if err != nil {
+		t.Fatalf("Dispatch: %v", err)
+	}
+	if !updateCommissionCalled || !writeLogCalled {
+		t.Fatalf("expected both UpdateCommission and WriteCommissionLog to be called (uc=%v wl=%v)", updateCommissionCalled, writeLogCalled)
+	}
+	if writeLogType != logmodel.CommissionTypeLottery {
+		t.Fatalf("expected CommissionTypeLottery(%d), got %d", logmodel.CommissionTypeLottery, writeLogType)
+	}
+	if writeLogAmount != 300 {
+		t.Fatalf("expected amount 300, got %d", writeLogAmount)
+	}
+	if writeLogOrderNo != "lottery:100:200" {
+		t.Fatalf("expected orderNo to reuse ExternalRef, got %q", writeLogOrderNo)
+	}
+}
+
+func TestCommission_BadConfigRejected(t *testing.T) {
+	db, _, cleanup := newHandlerTestDB(t)
+	defer cleanup()
+
+	h := NewCommissionHandler(CommissionDeps{
+		Ledger:             &fakeLedger{},
+		UpdateCommission:   func(context.Context, int64, int64, ...*gorm.DB) error { return nil },
+		WriteCommissionLog: func(*gorm.DB, int64, uint16, int64, string) error { return nil },
+	})
+	tests := []struct {
+		name   string
+		config string
+	}{
+		{name: "invalid json", config: `{bad`},
+		{name: "zero amount", config: `{"amount_cents":0}`},
+		{name: "negative amount", config: `{"amount_cents":-1}`},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			_, err := h.Dispatch(context.Background(), db, lottery.DispatchRequest{
+				Prize:          lottery.Prize{Config: tt.config},
+				IdempotencyKey: "k",
+			})
+			if err == nil {
+				t.Fatalf("expected error on %s", tt.name)
+			}
+		})
+	}
+}
+
+func TestCommission_MissingDepsFailsFast(t *testing.T) {
+	db, _, cleanup := newHandlerTestDB(t)
+	defer cleanup()
+
+	h := NewCommissionHandler(CommissionDeps{
+		Ledger:             &fakeLedger{},
+		WriteCommissionLog: func(*gorm.DB, int64, uint16, int64, string) error { return nil },
+	})
+	_, err := h.Dispatch(context.Background(), db, lottery.DispatchRequest{
+		IdempotencyKey: "k",
+		Prize:          lottery.Prize{Config: `{"amount_cents":1}`},
+	})
+	if err == nil {
+		t.Fatalf("expected error when deps missing")
+	}
+}
diff --git a/internal/logic/lottery/handler/testhelpers_test.go b/internal/logic/lottery/handler/testhelpers_test.go
new file mode 100644
index 0000000..e85ba40
--- /dev/null
+++ b/internal/logic/lottery/handler/testhelpers_test.go
@@ -0,0 +1,12 @@
+package handler
+
+import (
+	"database/sql/driver"
+
+	"github.com/DATA-DOG/go-sqlmock"
+)
+
+// sqlmockAnyResult 是 sqlmock.NewResult 的简写，语义与它一致（0 影响行）。
+func sqlmockAnyResult() driver.Result {
+	return sqlmock.NewResult(0, 1)
+}
diff --git a/internal/logic/lottery/handler/vpn_duration.go b/internal/logic/lottery/handler/vpn_duration.go
new file mode 100644
index 0000000..f76d928
--- /dev/null
+++ b/internal/logic/lottery/handler/vpn_duration.go
@@ -0,0 +1,226 @@
+// Package handler contains real PrizeHandler implementations for lottery prize
+// dispatch. Handlers live in the logic layer because they depend on UserModel,
+// NodeModel, and commonLogic — importing those from the pure-model
+// internal/model/lottery package would flip the layering.
+//
+// All Dispatch entry points are called inside the draw service's transaction
+// and must remain tx-only: no cache invalidation, no goroutine fan-out. The
+// draw service is responsible for post-commit side effects (node cache clear,
+// user group recalculation) once the enclosing transaction commits.
+package handler
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"time"
+
+	commonLogic "github.com/perfect-panel/server/internal/logic/common"
+	"github.com/perfect-panel/server/internal/model/lottery"
+	usermodel "github.com/perfect-panel/server/internal/model/user"
+	"gorm.io/gorm"
+)
+
+// VPNDurationHandler 发放"N 天订阅时长"。
+//
+// 幂等模型：DispatchRequest.IdempotencyKey → lottery_grant_ledger.external_ref。
+// Reserve 命中即幂等，返回 payload 里之前记录的 message；未命中才走真实发放。
+//
+// 家庭组：走 ResolveEffectiveUser 归位到 owner；若 owner 无活跃订阅，日志
+// "skipped" 并返回 auto_claimed（与 grantGiftDays 的行为一致，避免中奖后无处发
+// 的场景导致抽奖事务回滚吞事件）。
+type VPNDurationHandler struct {
+	deps VPNDurationDeps
+}
+
+// VPNDurationDeps 是 VPNDurationHandler 需要的依赖。用 struct 显式收拢，避免
+// 直接依赖庞大的 ServiceContext；测试时可注入实现了同接口的 mock。
+type VPNDurationDeps struct {
+	UserModel usermodel.Model
+	Ledger    lottery.LedgerService
+	DB        *gorm.DB
+	// ResolveEffectiveUser 用于家庭组归位。为 nil 时不做归位（等价于身份函数）。
+	// 生产接线用 DefaultResolveEffectiveUser(DB) 包出闭包。
+	ResolveEffectiveUser func(ctx context.Context, userID int64) (int64, error)
+}
+
+// DefaultResolveEffectiveUser 是生产环境的家庭组归位实现：走
+// commonLogic.ResolveEntitlementUser。用 struct 依赖注入避免 handler 直接依赖
+// 具体 SQL —— 测试里 stub 掉。
+func DefaultResolveEffectiveUser(db *gorm.DB) func(ctx context.Context, userID int64) (int64, error) {
+	return func(ctx context.Context, userID int64) (int64, error) {
+		entitlement, err := commonLogic.ResolveEntitlementUser(ctx, db, userID)
+		if err != nil {
+			return 0, err
+		}
+		if entitlement == nil || entitlement.EffectiveUserID <= 0 {
+			return userID, nil
+		}
+		return entitlement.EffectiveUserID, nil
+	}
+}
+
+// NewVPNDurationHandler 构造真实的 vpn_duration handler。
+func NewVPNDurationHandler(deps VPNDurationDeps) *VPNDurationHandler {
+	return &VPNDurationHandler{deps: deps}
+}
+
+// Type / IsAuto / ValidateClaim 实现 PrizeHandler 接口。
+func (*VPNDurationHandler) Type() string               { return lottery.PrizeTypeVPNDuration }
+func (*VPNDurationHandler) IsAuto() bool               { return true }
+func (*VPNDurationHandler) ValidateClaim([]byte) error { return nil }
+
+// vpnDurationConfig 是奖品 Config JSON 的解码目标。
+type vpnDurationConfig struct {
+	DurationDays int `json:"duration_days"`
+}
+
+// vpnDurationPayload 落库到 lottery_grant_ledger.payload，用于幂等重放时返回同一
+// message；同时便于对账（哪条 user_subscribe 被延长、延长了多少天）。
+type vpnDurationPayload struct {
+	EffectiveUserID int64  `json:"effective_user_id"`
+	SubscribeID     int64  `json:"subscribe_id"`
+	Days            int    `json:"days"`
+	Message         string `json:"message"`
+}
+
+// Dispatch 在 caller 的事务内发放订阅时长。
+func (h *VPNDurationHandler) Dispatch(ctx context.Context, tx *gorm.DB, req lottery.DispatchRequest) (lottery.DispatchResult, error) {
+	if tx == nil {
+		return lottery.DispatchResult{}, errors.New("vpn_duration handler requires a transaction")
+	}
+	if req.IdempotencyKey == "" {
+		return lottery.DispatchResult{}, errors.New("vpn_duration handler requires DispatchRequest.IdempotencyKey")
+	}
+
+	var cfg vpnDurationConfig
+	if err := json.Unmarshal([]byte(req.Prize.Config), &cfg); err != nil {
+		return lottery.DispatchResult{}, fmt.Errorf("decode vpn_duration config: %w", err)
+	}
+	if cfg.DurationDays <= 0 {
+		return lottery.DispatchResult{}, fmt.Errorf("vpn_duration config duration_days must be > 0, got %d", cfg.DurationDays)
+	}
+
+	// 家庭组归位：注入的 ResolveEffectiveUser 决定是否穿透到 owner。
+	effectiveUserID := req.UserId
+	if h.deps.ResolveEffectiveUser != nil {
+		if eid, err := h.deps.ResolveEffectiveUser(ctx, req.UserId); err == nil && eid > 0 {
+			effectiveUserID = eid
+		}
+	}
+
+	entry := lottery.GrantLedger{
+		ExternalRef: req.IdempotencyKey,
+		HandlerType: lottery.PrizeTypeVPNDuration,
+		UserId:      effectiveUserID,
+		ActivityId:  req.ActivityId,
+		DrawId:      req.DrawId,
+		Amount:      int64(cfg.DurationDays),
+	}
+	row, alreadyExisted, err := h.deps.Ledger.Reserve(ctx, tx, entry)
+	if err != nil {
+		return lottery.DispatchResult{}, fmt.Errorf("reserve grant ledger: %w", err)
+	}
+	if alreadyExisted {
+		// 幂等命中：直接返回之前记录的 payload.message。
+		var payload vpnDurationPayload
+		if row.Payload != "" {
+			_ = json.Unmarshal([]byte(row.Payload), &payload)
+		}
+		if payload.Message == "" {
+			payload.Message = "已加到订阅"
+		}
+		return lottery.DispatchResult{State: lottery.DispatchStateAutoClaimed, Message: payload.Message}, nil
+	}
+
+	// 未存在 → 真实发放。查用户的活跃订阅。
+	activeSub, findErr := h.findActiveSubscribe(ctx, effectiveUserID)
+	if errors.Is(findErr, gorm.ErrRecordNotFound) {
+		// 与 grantGiftDays 一致：无活跃订阅时记录 skipped 但不失败。
+		payload := vpnDurationPayload{
+			EffectiveUserID: effectiveUserID,
+			Days:            cfg.DurationDays,
+			Message:         "跳过：用户无活跃订阅",
+		}
+		if err := h.writeBackPayload(ctx, tx, row.Id, payload); err != nil {
+			return lottery.DispatchResult{}, err
+		}
+		return lottery.DispatchResult{State: lottery.DispatchStateAutoClaimed, Message: payload.Message}, nil
+	}
+	if findErr != nil {
+		return lottery.DispatchResult{}, fmt.Errorf("find active subscribe for user %d: %w", effectiveUserID, findErr)
+	}
+
+	// 计算新 ExpireTime。样板见 activateOrderLogic.go:1336-1342：
+	//  a) NoLimit 永久（time.UnixMilli(0)）→ 不延长
+	//  b) 已过期 → 从 now 起加
+	//  c) 未过期 → 从 ExpireTime 起加
+	now := time.Now()
+	if !activeSub.ExpireTime.Equal(time.UnixMilli(0)) {
+		if activeSub.ExpireTime.Before(now) {
+			activeSub.ExpireTime = now.Add(time.Duration(cfg.DurationDays) * 24 * time.Hour)
+		} else {
+			activeSub.ExpireTime = activeSub.ExpireTime.Add(time.Duration(cfg.DurationDays) * 24 * time.Hour)
+		}
+	}
+	activeSub.Status = 1
+	activeSub.FinishedAt = nil
+
+	if err := h.deps.UserModel.UpdateSubscribe(ctx, activeSub, tx); err != nil {
+		return lottery.DispatchResult{}, fmt.Errorf("update subscribe %d: %w", activeSub.Id, err)
+	}
+
+	payload := vpnDurationPayload{
+		EffectiveUserID: effectiveUserID,
+		SubscribeID:     activeSub.Id,
+		Days:            cfg.DurationDays,
+		Message:         fmt.Sprintf("已加 %d 天到订阅", cfg.DurationDays),
+	}
+	if err := h.writeBackPayload(ctx, tx, row.Id, payload); err != nil {
+		return lottery.DispatchResult{}, err
+	}
+	return lottery.DispatchResult{State: lottery.DispatchStateAutoClaimed, Message: payload.Message}, nil
+}
+
+// findActiveSubscribe 优先走 UserModel.FindActiveSubscribe；未找到则回退到
+// 最新 token 非空的历史订阅（样板 activateOrderLogic.go:1371-1393）。
+func (h *VPNDurationHandler) findActiveSubscribe(ctx context.Context, userID int64) (*usermodel.Subscribe, error) {
+	activeSub, err := h.deps.UserModel.FindActiveSubscribe(ctx, userID)
+	if err == nil {
+		return activeSub, nil
+	}
+	if !errors.Is(err, gorm.ErrRecordNotFound) {
+		return nil, err
+	}
+	if h.deps.DB == nil {
+		return nil, gorm.ErrRecordNotFound
+	}
+	var fallback usermodel.Subscribe
+	fallbackErr := h.deps.DB.WithContext(ctx).
+		Model(&usermodel.Subscribe{}).
+		Where("user_id = ? AND token != ''", userID).
+		Where("status IN ?", []int64{0, 1, 2, 3}).
+		Order("expire_time DESC").
+		Order("updated_at DESC").
+		Order("id DESC").
+		First(&fallback).Error
+	if fallbackErr != nil {
+		return nil, fallbackErr
+	}
+	return &fallback, nil
+}
+
+func (h *VPNDurationHandler) writeBackPayload(ctx context.Context, tx *gorm.DB, ledgerID int64, payload vpnDurationPayload) error {
+	raw, err := json.Marshal(payload)
+	if err != nil {
+		return fmt.Errorf("marshal ledger payload: %w", err)
+	}
+	if err := tx.WithContext(ctx).
+		Model(&lottery.GrantLedger{}).
+		Where("id = ?", ledgerID).
+		UpdateColumn("payload", string(raw)).Error; err != nil {
+		return fmt.Errorf("update ledger payload: %w", err)
+	}
+	return nil
+}
diff --git a/internal/logic/lottery/handler/vpn_duration_test.go b/internal/logic/lottery/handler/vpn_duration_test.go
new file mode 100644
index 0000000..0aeb667
--- /dev/null
+++ b/internal/logic/lottery/handler/vpn_duration_test.go
@@ -0,0 +1,345 @@
+package handler
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/DATA-DOG/go-sqlmock"
+	"github.com/perfect-panel/server/internal/model/lottery"
+	usermodel "github.com/perfect-panel/server/internal/model/user"
+	"gorm.io/driver/mysql"
+	"gorm.io/gorm"
+)
+
+// newHandlerTestDB 建一个 sqlmock 支撑的 gorm.DB，子测试直接把它当 tx 传给 handler。
+func newHandlerTestDB(t *testing.T) (*gorm.DB, sqlmock.Sqlmock, func()) {
+	t.Helper()
+	sqlDB, mock, err := sqlmock.New(sqlmock.QueryMatcherOption(sqlmock.QueryMatcherFunc(func(expected, actual string) error {
+		if strings.Contains(actual, expected) {
+			return nil
+		}
+		return errors.New("actual sql does not contain expected: " + expected)
+	})))
+	if err != nil {
+		t.Fatalf("create sqlmock: %v", err)
+	}
+	db, err := gorm.Open(mysql.New(mysql.Config{Conn: sqlDB, SkipInitializeWithVersion: true}), &gorm.Config{
+		SkipDefaultTransaction: true,
+	})
+	if err != nil {
+		_ = sqlDB.Close()
+		t.Fatalf("open gorm db: %v", err)
+	}
+	return db, mock, func() { _ = sqlDB.Close() }
+}
+
+// fakeLedger 让 handler 单测不依赖真实 SQL，只验证控制流。
+type fakeLedger struct {
+	reserveFn func(ctx context.Context, tx *gorm.DB, entry lottery.GrantLedger) (*lottery.GrantLedger, bool, error)
+}
+
+func (f *fakeLedger) Reserve(ctx context.Context, tx *gorm.DB, entry lottery.GrantLedger) (*lottery.GrantLedger, bool, error) {
+	return f.reserveFn(ctx, tx, entry)
+}
+
+// fakeUserModel 满足 usermodel.Model 里 handler 用到的两个方法。
+type fakeUserModel struct {
+	usermodel.Model
+	findActive      func(ctx context.Context, userID int64) (*usermodel.Subscribe, error)
+	updateSubscribe func(ctx context.Context, sub *usermodel.Subscribe, tx ...*gorm.DB) error
+}
+
+func (f *fakeUserModel) FindActiveSubscribe(ctx context.Context, userID int64) (*usermodel.Subscribe, error) {
+	return f.findActive(ctx, userID)
+}
+func (f *fakeUserModel) UpdateSubscribe(ctx context.Context, sub *usermodel.Subscribe, tx ...*gorm.DB) error {
+	return f.updateSubscribe(ctx, sub, tx...)
+}
+
+// identityResolver 单测里的家庭组归位：始终返回自身。
+func identityResolver(_ context.Context, userID int64) (int64, error) { return userID, nil }
+
+func TestVPNDuration_RequiresIdempotencyKey(t *testing.T) {
+	db, _, cleanup := newHandlerTestDB(t)
+	defer cleanup()
+
+	h := NewVPNDurationHandler(VPNDurationDeps{
+		Ledger:               &fakeLedger{},
+		DB:                   db,
+		ResolveEffectiveUser: identityResolver,
+	})
+	_, err := h.Dispatch(context.Background(), db, lottery.DispatchRequest{})
+	if err == nil || !strings.Contains(err.Error(), "IdempotencyKey") {
+		t.Fatalf("expected IdempotencyKey error, got %v", err)
+	}
+}
+
+func TestVPNDuration_RequiresTx(t *testing.T) {
+	h := NewVPNDurationHandler(VPNDurationDeps{Ledger: &fakeLedger{}})
+	_, err := h.Dispatch(context.Background(), nil, lottery.DispatchRequest{IdempotencyKey: "k"})
+	if err == nil || !strings.Contains(err.Error(), "transaction") {
+		t.Fatalf("expected tx error, got %v", err)
+	}
+}
+
+func TestVPNDuration_IdempotentHitReturnsStoredMessage(t *testing.T) {
+	db, _, cleanup := newHandlerTestDB(t)
+	defer cleanup()
+
+	stored := lottery.GrantLedger{
+		Id:          9,
+		ExternalRef: "lottery:100:200",
+		Payload:     `{"message":"已加 3 天到订阅"}`,
+	}
+	ledger := &fakeLedger{
+		reserveFn: func(_ context.Context, _ *gorm.DB, _ lottery.GrantLedger) (*lottery.GrantLedger, bool, error) {
+			return &stored, true, nil
+		},
+	}
+	fake := &fakeUserModel{
+		findActive: func(context.Context, int64) (*usermodel.Subscribe, error) {
+			t.Fatal("must NOT touch UserModel on idempotent hit")
+			return nil, nil
+		},
+		updateSubscribe: func(context.Context, *usermodel.Subscribe, ...*gorm.DB) error {
+			t.Fatal("must NOT touch UserModel on idempotent hit")
+			return nil
+		},
+	}
+
+	h := NewVPNDurationHandler(VPNDurationDeps{
+		Ledger:               ledger,
+		UserModel:            fake,
+		DB:                   db,
+		ResolveEffectiveUser: identityResolver,
+	})
+	res, err := h.Dispatch(context.Background(), db, lottery.DispatchRequest{
+		UserId:         42,
+		ActivityId:     100,
+		DrawId:         200,
+		Prize:          lottery.Prize{Config: `{"duration_days":3}`},
+		IdempotencyKey: "lottery:100:200",
+	})
+	if err != nil {
+		t.Fatalf("Dispatch: %v", err)
+	}
+	if res.State != lottery.DispatchStateAutoClaimed {
+		t.Fatalf("expected auto_claimed, got %q", res.State)
+	}
+	if res.Message != "已加 3 天到订阅" {
+		t.Fatalf("expected stored message, got %q", res.Message)
+	}
+}
+
+func TestVPNDuration_NoActiveSubscribeSkipsWithoutError(t *testing.T) {
+	db, mock, cleanup := newHandlerTestDB(t)
+	defer cleanup()
+
+	ledger := &fakeLedger{
+		reserveFn: func(_ context.Context, _ *gorm.DB, entry lottery.GrantLedger) (*lottery.GrantLedger, bool, error) {
+			return &lottery.GrantLedger{Id: 5, ExternalRef: entry.ExternalRef}, false, nil
+		},
+	}
+	fake := &fakeUserModel{
+		findActive: func(context.Context, int64) (*usermodel.Subscribe, error) {
+			return nil, gorm.ErrRecordNotFound
+		},
+		updateSubscribe: func(context.Context, *usermodel.Subscribe, ...*gorm.DB) error {
+			t.Fatal("must NOT UpdateSubscribe when no active sub")
+			return nil
+		},
+	}
+
+	// fallback query returns no rows either
+	mock.ExpectQuery("FROM `user_subscribe`").
+		WillReturnError(gorm.ErrRecordNotFound)
+	mock.ExpectExec("UPDATE `lottery_grant_ledger`").
+		WillReturnResult(sqlmock.NewResult(0, 1))
+
+	h := NewVPNDurationHandler(VPNDurationDeps{
+		Ledger: ledger, UserModel: fake, DB: db, ResolveEffectiveUser: identityResolver,
+	})
+	res, err := h.Dispatch(context.Background(), db, lottery.DispatchRequest{
+		UserId:         42,
+		ActivityId:     100,
+		DrawId:         200,
+		Prize:          lottery.Prize{Config: `{"duration_days":3}`},
+		IdempotencyKey: "lottery:100:200",
+	})
+	if err != nil {
+		t.Fatalf("Dispatch: %v", err)
+	}
+	if res.State != lottery.DispatchStateAutoClaimed {
+		t.Fatalf("expected auto_claimed even on skip, got %q", res.State)
+	}
+	if !strings.Contains(res.Message, "跳过") {
+		t.Fatalf("expected skip message, got %q", res.Message)
+	}
+}
+
+func TestVPNDuration_ExtendsExistingExpireTime(t *testing.T) {
+	db, mock, cleanup := newHandlerTestDB(t)
+	defer cleanup()
+
+	future := time.Now().Add(10 * 24 * time.Hour).Truncate(time.Second)
+	activeSub := &usermodel.Subscribe{
+		Id:         77,
+		UserId:     42,
+		ExpireTime: future,
+		Status:     1,
+	}
+
+	ledger := &fakeLedger{
+		reserveFn: func(_ context.Context, _ *gorm.DB, _ lottery.GrantLedger) (*lottery.GrantLedger, bool, error) {
+			return &lottery.GrantLedger{Id: 5, ExternalRef: "lottery:100:200"}, false, nil
+		},
+	}
+
+	updateCalled := false
+	fake := &fakeUserModel{
+		findActive: func(context.Context, int64) (*usermodel.Subscribe, error) { return activeSub, nil },
+		updateSubscribe: func(_ context.Context, sub *usermodel.Subscribe, _ ...*gorm.DB) error {
+			updateCalled = true
+			expected := future.Add(3 * 24 * time.Hour)
+			if !sub.ExpireTime.Equal(expected) {
+				t.Fatalf("expire time not stacked: got %s want %s", sub.ExpireTime, expected)
+			}
+			if sub.Status != 1 {
+				t.Fatalf("expected Status=1 after grant, got %d", sub.Status)
+			}
+			return nil
+		},
+	}
+
+	mock.ExpectExec("UPDATE `lottery_grant_ledger`").
+		WillReturnResult(sqlmock.NewResult(0, 1))
+
+	h := NewVPNDurationHandler(VPNDurationDeps{
+		Ledger: ledger, UserModel: fake, DB: db, ResolveEffectiveUser: identityResolver,
+	})
+	res, err := h.Dispatch(context.Background(), db, lottery.DispatchRequest{
+		UserId:         42,
+		ActivityId:     100,
+		DrawId:         200,
+		Prize:          lottery.Prize{Config: `{"duration_days":3}`},
+		IdempotencyKey: "lottery:100:200",
+	})
+	if err != nil {
+		t.Fatalf("Dispatch: %v", err)
+	}
+	if !updateCalled {
+		t.Fatalf("expected UpdateSubscribe to be called")
+	}
+	if res.Message != "已加 3 天到订阅" {
+		t.Fatalf("unexpected message: %q", res.Message)
+	}
+}
+
+func TestVPNDuration_ExpiredSubscribeRestartsFromNow(t *testing.T) {
+	db, mock, cleanup := newHandlerTestDB(t)
+	defer cleanup()
+
+	past := time.Now().Add(-24 * time.Hour)
+	activeSub := &usermodel.Subscribe{
+		Id:         77,
+		ExpireTime: past,
+	}
+
+	ledger := &fakeLedger{
+		reserveFn: func(_ context.Context, _ *gorm.DB, _ lottery.GrantLedger) (*lottery.GrantLedger, bool, error) {
+			return &lottery.GrantLedger{Id: 5}, false, nil
+		},
+	}
+	fake := &fakeUserModel{
+		findActive: func(context.Context, int64) (*usermodel.Subscribe, error) { return activeSub, nil },
+		updateSubscribe: func(_ context.Context, sub *usermodel.Subscribe, _ ...*gorm.DB) error {
+			delta := time.Until(sub.ExpireTime)
+			if delta < 3*24*time.Hour-5*time.Second || delta > 3*24*time.Hour+5*time.Second {
+				t.Fatalf("expected ~3 days from now, got %v", delta)
+			}
+			return nil
+		},
+	}
+
+	mock.ExpectExec("UPDATE `lottery_grant_ledger`").WillReturnResult(sqlmock.NewResult(0, 1))
+
+	h := NewVPNDurationHandler(VPNDurationDeps{
+		Ledger: ledger, UserModel: fake, DB: db, ResolveEffectiveUser: identityResolver,
+	})
+	_, _ = h.Dispatch(context.Background(), db, lottery.DispatchRequest{
+		Prize:          lottery.Prize{Config: `{"duration_days":3}`},
+		IdempotencyKey: "k",
+	})
+}
+
+func TestVPNDuration_NoLimitNotExtended(t *testing.T) {
+	db, mock, cleanup := newHandlerTestDB(t)
+	defer cleanup()
+
+	noLimit := time.UnixMilli(0)
+	activeSub := &usermodel.Subscribe{
+		Id:         77,
+		ExpireTime: noLimit,
+		Status:     1,
+	}
+
+	ledger := &fakeLedger{
+		reserveFn: func(_ context.Context, _ *gorm.DB, _ lottery.GrantLedger) (*lottery.GrantLedger, bool, error) {
+			return &lottery.GrantLedger{Id: 5}, false, nil
+		},
+	}
+	fake := &fakeUserModel{
+		findActive: func(context.Context, int64) (*usermodel.Subscribe, error) { return activeSub, nil },
+		updateSubscribe: func(_ context.Context, sub *usermodel.Subscribe, _ ...*gorm.DB) error {
+			if !sub.ExpireTime.Equal(noLimit) {
+				t.Fatalf("no-limit ExpireTime must not be extended, got %v", sub.ExpireTime)
+			}
+			return nil
+		},
+	}
+
+	mock.ExpectExec("UPDATE `lottery_grant_ledger`").WillReturnResult(sqlmock.NewResult(0, 1))
+
+	h := NewVPNDurationHandler(VPNDurationDeps{
+		Ledger: ledger, UserModel: fake, DB: db, ResolveEffectiveUser: identityResolver,
+	})
+	_, _ = h.Dispatch(context.Background(), db, lottery.DispatchRequest{
+		Prize:          lottery.Prize{Config: `{"duration_days":3}`},
+		IdempotencyKey: "k",
+	})
+}
+
+func TestVPNDuration_BadConfigRejected(t *testing.T) {
+	db, _, cleanup := newHandlerTestDB(t)
+	defer cleanup()
+
+	h := NewVPNDurationHandler(VPNDurationDeps{
+		Ledger:               &fakeLedger{},
+		DB:                   db,
+		ResolveEffectiveUser: identityResolver,
+	})
+	tests := []struct {
+		name   string
+		config string
+	}{
+		{name: "invalid json", config: `{bad`},
+		{name: "zero days", config: `{"duration_days":0}`},
+		{name: "negative days", config: `{"duration_days":-1}`},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			_, err := h.Dispatch(context.Background(), db, lottery.DispatchRequest{
+				Prize:          lottery.Prize{Config: tt.config},
+				IdempotencyKey: "k",
+			})
+			if err == nil {
+				t.Fatalf("expected error on %s", tt.name)
+			}
+		})
+	}
+	_ = json.Unmarshal
+}
diff --git a/internal/logic/lottery/hook/invite.go b/internal/logic/lottery/hook/invite.go
new file mode 100644
index 0000000..978aa1a
--- /dev/null
+++ b/internal/logic/lottery/hook/invite.go
@@ -0,0 +1,137 @@
+// Package hook contains lottery-side outbound integrations — hooks other flows
+// (order activation, sign-in, etc.) call after they succeed to feed events into
+// the lottery system.
+//
+// All hooks are fire-and-forget by contract: they run in their own goroutine so
+// caller latency and error handling are unaffected. Hook failures are logged
+// and dropped — an invite that fails to earn a lottery chance never blocks the
+// order it was piggy-backing on.
+package hook
+
+import (
+	"context"
+	"encoding/json"
+	"time"
+
+	"github.com/perfect-panel/server/internal/model/lottery"
+	"github.com/perfect-panel/server/pkg/logger"
+	"gorm.io/gorm"
+)
+
+// InviteHook is fired by order/renewal activation when an invited user
+// completes a payment. It grants lottery chances to the referer across every
+// currently running activity that declares an "invite_success" chance source.
+type InviteHook interface {
+	// OnConversion queues a background grant for referer. Returns immediately.
+	// Safe to call with refererUserID=0 (no-op) or orderNo="" (no-op).
+	OnConversion(ctx context.Context, refererUserID int64, orderNo string)
+}
+
+// NoopInviteHook is a safe placeholder for callers that need an InviteHook
+// value before the lottery system is wired in. Its OnConversion returns
+// immediately without side effects — no goroutine, no log spam.
+func NoopInviteHook() InviteHook { return noopInviteHook{} }
+
+type noopInviteHook struct{}
+
+func (noopInviteHook) OnConversion(_ context.Context, _ int64, _ string) {}
+
+// defaultInviteHook is the production implementation. It queries running
+// activities on every call rather than caching them — the query is cheap
+// (small table, indexed by status+time), and skipping the cache avoids stale
+// reads when an activity is paused or its chance_sources are re-configured.
+type defaultInviteHook struct {
+	db     *gorm.DB
+	chance lottery.ChanceService
+}
+
+// NewInviteHook builds the production invite hook.
+func NewInviteHook(db *gorm.DB, chance lottery.ChanceService) InviteHook {
+	if db == nil || chance == nil {
+		return NoopInviteHook()
+	}
+	return &defaultInviteHook{db: db, chance: chance}
+}
+
+// OnConversion spawns a fire-and-forget goroutine that walks all running
+// activities and calls ChanceService.Grant for each one that declares an
+// invite_success source.
+func (h *defaultInviteHook) OnConversion(_ context.Context, refererUserID int64, orderNo string) {
+	if refererUserID <= 0 || orderNo == "" {
+		return
+	}
+	go h.run(refererUserID, orderNo)
+}
+
+func (h *defaultInviteHook) run(refererUserID int64, orderNo string) {
+	// Fresh context so the caller cancelling their goroutine does not abort us.
+	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+	defer cancel()
+
+	activities, err := h.loadRunningActivities(ctx)
+	if err != nil {
+		logger.WithContext(ctx).Error("[lottery invite hook] load running activities failed",
+			logger.Field("error", err.Error()),
+			logger.Field("referer_user_id", refererUserID),
+			logger.Field("order_no", orderNo),
+		)
+		return
+	}
+
+	for i := range activities {
+		activity := &activities[i]
+		grants := parseInviteGrantsFromSources(activity.ChanceSources)
+		for _, amount := range grants {
+			if amount <= 0 {
+				continue
+			}
+			// ChanceService.Grant is idempotent per (activity_id, source, source_ref).
+			// orderNo as source_ref makes both new-purchase and renewal safe: same
+			// order → same key → at most one chance grant per (activity, order).
+			if err := h.chance.Grant(ctx, refererUserID, activity.Id, lottery.ChanceSourceInviteSuccess, orderNo, amount); err != nil {
+				logger.WithContext(ctx).Error("[lottery invite hook] Grant failed",
+					logger.Field("error", err.Error()),
+					logger.Field("referer_user_id", refererUserID),
+					logger.Field("activity_id", activity.Id),
+					logger.Field("order_no", orderNo),
+				)
+			}
+		}
+	}
+}
+
+func (h *defaultInviteHook) loadRunningActivities(ctx context.Context) ([]lottery.Activity, error) {
+	now := time.Now()
+	var activities []lottery.Activity
+	if err := h.db.WithContext(ctx).
+		Model(&lottery.Activity{}).
+		Where("status = ?", lottery.ActivityStatusRunning).
+		Where("start_at <= ? AND end_at >= ?", now, now).
+		Find(&activities).Error; err != nil {
+		return nil, err
+	}
+	return activities, nil
+}
+
+// parseInviteGrantsFromSources decodes the JSON chance_sources array on an
+// activity and returns the per-conversion grant amount for each invite_success
+// source (an activity may declare multiple, e.g. with different params by
+// referer tier — v1 does not, but the loop is a cheap forward-compatibility).
+func parseInviteGrantsFromSources(raw string) []int {
+	if raw == "" {
+		return nil
+	}
+	var sources []lottery.ChanceSource
+	if err := json.Unmarshal([]byte(raw), &sources); err != nil {
+		// Malformed configs skip silently — the activity is misconfigured, not
+		// a hook fault. Admin CRUD (PR C) will surface it.
+		return nil
+	}
+	out := make([]int, 0, len(sources))
+	for _, s := range sources {
+		if s.Source == lottery.ChanceSourceInviteSuccess && s.Amount > 0 {
+			out = append(out, s.Amount)
+		}
+	}
+	return out
+}
diff --git a/internal/logic/lottery/hook/invite_test.go b/internal/logic/lottery/hook/invite_test.go
new file mode 100644
index 0000000..3eb0380
--- /dev/null
+++ b/internal/logic/lottery/hook/invite_test.go
@@ -0,0 +1,191 @@
+package hook
+
+import (
+	"context"
+	"errors"
+	"strings"
+	"sync"
+	"testing"
+	"time"
+
+	"github.com/DATA-DOG/go-sqlmock"
+	"github.com/perfect-panel/server/internal/model/lottery"
+	"gorm.io/driver/mysql"
+	"gorm.io/gorm"
+)
+
+func newHookTestDB(t *testing.T) (*gorm.DB, sqlmock.Sqlmock, func()) {
+	t.Helper()
+	sqlDB, mock, err := sqlmock.New(sqlmock.QueryMatcherOption(sqlmock.QueryMatcherFunc(func(expected, actual string) error {
+		if strings.Contains(actual, expected) {
+			return nil
+		}
+		return errors.New("actual sql does not contain expected: " + expected)
+	})))
+	if err != nil {
+		t.Fatalf("create sqlmock: %v", err)
+	}
+	db, err := gorm.Open(mysql.New(mysql.Config{Conn: sqlDB, SkipInitializeWithVersion: true}), &gorm.Config{SkipDefaultTransaction: true})
+	if err != nil {
+		_ = sqlDB.Close()
+		t.Fatalf("open gorm db: %v", err)
+	}
+	return db, mock, func() { _ = sqlDB.Close() }
+}
+
+type chanceCall struct {
+	userId, activityId int64
+	source, sourceRef  string
+	amount             int
+}
+
+type fakeChanceService struct {
+	mu    sync.Mutex
+	calls []chanceCall
+	err   error
+}
+
+func (f *fakeChanceService) Grant(_ context.Context, userId, activityId int64, source, sourceRef string, amount int) error {
+	f.mu.Lock()
+	defer f.mu.Unlock()
+	f.calls = append(f.calls, chanceCall{userId, activityId, source, sourceRef, amount})
+	return f.err
+}
+func (*fakeChanceService) Consume(context.Context, *gorm.DB, int64, int64) (int64, error) {
+	return 0, nil
+}
+func (*fakeChanceService) Query(context.Context, int64, int64) (int64, error) { return 0, nil }
+
+func (f *fakeChanceService) recorded() []chanceCall {
+	f.mu.Lock()
+	defer f.mu.Unlock()
+	out := make([]chanceCall, len(f.calls))
+	copy(out, f.calls)
+	return out
+}
+
+func TestNoopInviteHook_IsInert(t *testing.T) {
+	NoopInviteHook().OnConversion(context.Background(), 1, "ord")
+}
+
+func TestInviteHook_SkipsWhenRefererMissing(t *testing.T) {
+	chance := &fakeChanceService{}
+	h := NewInviteHook(&gorm.DB{}, chance) // won't touch DB because refererUserID=0
+	h.OnConversion(context.Background(), 0, "ord")
+	// No goroutine means no calls; give scheduler a beat and confirm empty.
+	time.Sleep(20 * time.Millisecond)
+	if len(chance.recorded()) != 0 {
+		t.Fatalf("expected no Grant when refererUserID=0, got %+v", chance.recorded())
+	}
+}
+
+func TestInviteHook_GrantsForEachRunningActivity(t *testing.T) {
+	db, mock, cleanup := newHookTestDB(t)
+	defer cleanup()
+
+	// Activity 100: single invite_success source, amount=1
+	// Activity 200: two sources, only invite_success (amount=2) counts
+	// Activity 300: has invite_success amount=0 → skipped
+	mock.ExpectQuery("FROM `lottery_activity`").
+		WillReturnRows(sqlmock.NewRows([]string{"id", "chance_sources", "status", "start_at", "end_at", "eligibility", "grid_size", "unmet_action"}).
+			AddRow(int64(100), `[{"source":"invite_success","amount":1}]`, "running", time.Now(), time.Now().Add(24*time.Hour), "{}", 9, "block").
+			AddRow(int64(200), `[{"source":"daily_signin","amount":1},{"source":"invite_success","amount":2}]`, "running", time.Now(), time.Now().Add(24*time.Hour), "{}", 9, "block").
+			AddRow(int64(300), `[{"source":"invite_success","amount":0}]`, "running", time.Now(), time.Now().Add(24*time.Hour), "{}", 9, "block"))
+
+	chance := &fakeChanceService{}
+	h := NewInviteHook(db, chance)
+	h.OnConversion(context.Background(), 42, "order-xyz")
+
+	// give the goroutine time to complete
+	deadline := time.After(2 * time.Second)
+	for len(chance.recorded()) < 2 {
+		select {
+		case <-deadline:
+			t.Fatalf("timed out waiting for grants; got %+v", chance.recorded())
+		case <-time.After(20 * time.Millisecond):
+		}
+	}
+
+	calls := chance.recorded()
+	if len(calls) != 2 {
+		t.Fatalf("expected 2 grants (100 amount=1, 200 amount=2), got %+v", calls)
+	}
+	byActivity := map[int64]int{}
+	for _, c := range calls {
+		if c.source != lottery.ChanceSourceInviteSuccess {
+			t.Fatalf("unexpected source: %+v", c)
+		}
+		if c.sourceRef != "order-xyz" {
+			t.Fatalf("expected orderNo reused as source_ref, got %q", c.sourceRef)
+		}
+		if c.userId != 42 {
+			t.Fatalf("expected referer=42, got %d", c.userId)
+		}
+		byActivity[c.activityId] = c.amount
+	}
+	if byActivity[100] != 1 || byActivity[200] != 2 {
+		t.Fatalf("wrong amounts: %+v", byActivity)
+	}
+	if _, exists := byActivity[300]; exists {
+		t.Fatalf("activity 300 has invite_success amount=0 and must be skipped")
+	}
+}
+
+func TestInviteHook_MalformedChanceSourcesSkipsOnly(t *testing.T) {
+	db, mock, cleanup := newHookTestDB(t)
+	defer cleanup()
+
+	mock.ExpectQuery("FROM `lottery_activity`").
+		WillReturnRows(sqlmock.NewRows([]string{"id", "chance_sources", "status", "start_at", "end_at", "eligibility", "grid_size", "unmet_action"}).
+			AddRow(int64(100), `[{"source":"invite_success","amount":3}]`, "running", time.Now(), time.Now().Add(24*time.Hour), "{}", 9, "block").
+			AddRow(int64(200), `{bad-json`, "running", time.Now(), time.Now().Add(24*time.Hour), "{}", 9, "block"))
+
+	chance := &fakeChanceService{}
+	h := NewInviteHook(db, chance)
+	h.OnConversion(context.Background(), 42, "order-1")
+
+	deadline := time.After(2 * time.Second)
+	for len(chance.recorded()) < 1 {
+		select {
+		case <-deadline:
+			t.Fatalf("timed out; got %+v", chance.recorded())
+		case <-time.After(20 * time.Millisecond):
+		}
+	}
+
+	// Only the well-formed activity should have been granted; malformed skipped silently.
+	calls := chance.recorded()
+	if len(calls) != 1 || calls[0].activityId != 100 {
+		t.Fatalf("expected exactly 1 grant for activity 100, got %+v", calls)
+	}
+}
+
+func TestInviteHook_QueryFailureLogsAndReturns(t *testing.T) {
+	db, mock, cleanup := newHookTestDB(t)
+	defer cleanup()
+
+	mock.ExpectQuery("FROM `lottery_activity`").
+		WillReturnError(errors.New("db down"))
+
+	chance := &fakeChanceService{}
+	h := NewInviteHook(db, chance)
+	h.OnConversion(context.Background(), 42, "ord")
+
+	time.Sleep(200 * time.Millisecond)
+	if len(chance.recorded()) != 0 {
+		t.Fatalf("expected no grants when query fails, got %+v", chance.recorded())
+	}
+}
+
+func TestInviteHook_ParseHelperExposesInviteAmountsOnly(t *testing.T) {
+	got := parseInviteGrantsFromSources(`[{"source":"invite_success","amount":5},{"source":"daily_signin","amount":9},{"source":"invite_success","amount":0}]`)
+	if len(got) != 1 || got[0] != 5 {
+		t.Fatalf("expected [5], got %v", got)
+	}
+	if got := parseInviteGrantsFromSources(""); got != nil {
+		t.Fatalf("empty string should return nil, got %v", got)
+	}
+	if got := parseInviteGrantsFromSources(`{bad`); got != nil {
+		t.Fatalf("bad json should return nil, got %v", got)
+	}
+}
diff --git a/internal/model/log/log.go b/internal/model/log/log.go
index 0573d2c..de82f1b 100644
--- a/internal/model/log/log.go
+++ b/internal/model/log/log.go
@@ -52,6 +52,7 @@ const (
 	CommissionTypeConvertBalance uint16 = 336 // Convert to Balance
 	CommissionTypeWithdrawReject uint16 = 337 // Withdraw rejected refund
 	CommissionTypeWithdrawCancel uint16 = 338 // 用户取消提现退佣金
+	CommissionTypeLottery        uint16 = 339 // 抽奖奖励（PR B: 与 Purchase/Renewal 区分，便于对账）
 	GiftTypeIncrease             uint16 = 341 // Increase
 	GiftTypeReduce               uint16 = 342 // Reduce
 )
diff --git a/internal/model/lottery/grant_ledger.go b/internal/model/lottery/grant_ledger.go
new file mode 100644
index 0000000..96ed6e5
--- /dev/null
+++ b/internal/model/lottery/grant_ledger.go
@@ -0,0 +1,71 @@
+package lottery
+
+import (
+	"context"
+	"errors"
+	"time"
+
+	"gorm.io/gorm"
+	"gorm.io/gorm/clause"
+)
+
+// GrantLedger 是发奖账本一行。UNIQUE(external_ref) 是幂等键的载体：
+// 每次 PrizeHandler.Dispatch 用 DispatchRequest.IdempotencyKey 作 external_ref，
+// INSERT 冲突即"已发过"，直接返回持久化的原结果。
+type GrantLedger struct {
+	Id          int64     `gorm:"primaryKey"`
+	ExternalRef string    `gorm:"type:varchar(128);not null;uniqueIndex:uk_external_ref;comment:幂等键"`
+	HandlerType string    `gorm:"type:varchar(32);not null;comment:handler 类型"`
+	UserId      int64     `gorm:"type:bigint unsigned;not null;comment:发放对象用户 ID"`
+	ActivityId  int64     `gorm:"type:bigint unsigned;not null;comment:活动 ID"`
+	DrawId      int64     `gorm:"type:bigint unsigned;not null;comment:抽奖记录 ID"`
+	Amount      int64     `gorm:"type:bigint;not null;default:0;comment:发放数量"`
+	Payload     string    `gorm:"type:json;comment:发放后的关键结果快照"`
+	GrantedAt   time.Time `gorm:"<-:create;default:CURRENT_TIMESTAMP;comment:发放完成时间"`
+}
+
+// TableName 对齐 02157 migration。
+func (GrantLedger) TableName() string { return "lottery_grant_ledger" }
+
+// LedgerService 处理发奖账本的幂等 upsert。所有 handler 的第一步都是它。
+type LedgerService interface {
+	// Reserve 尝试为 external_ref 抢占一行账本。
+	//   - 未冲突 → 返回新建行，caller 继续调用下游业务；提交事务时账本一起落。
+	//   - 冲突   → 返回已存在的账本行，caller 视为幂等命中直接返回。
+	// 传入 tx 必须是 caller 的事务句柄，保证账本行随抽奖事务一起提交。
+	Reserve(ctx context.Context, tx *gorm.DB, entry GrantLedger) (row *GrantLedger, alreadyExisted bool, err error)
+}
+
+type ledgerService struct{}
+
+// NewLedgerService 返回默认账本服务。
+func NewLedgerService() LedgerService { return &ledgerService{} }
+
+// Reserve 用 INSERT ... ON CONFLICT DO NOTHING 抢占 external_ref。
+// 未命中时再走一次 SELECT 拿到实际持久化的行（不管是新插的还是旧的），
+// 目的是让 caller 拿到统一的 GrantLedger 结构，方便回写 draw 状态。
+func (s *ledgerService) Reserve(ctx context.Context, tx *gorm.DB, entry GrantLedger) (*GrantLedger, bool, error) {
+	if tx == nil {
+		return nil, false, errors.New("Reserve requires a transaction handle")
+	}
+	if entry.ExternalRef == "" {
+		return nil, false, errors.New("Reserve requires a non-empty ExternalRef")
+	}
+
+	insertRes := tx.WithContext(ctx).
+		Clauses(clause.OnConflict{DoNothing: true}).
+		Create(&entry)
+	if insertRes.Error != nil {
+		return nil, false, insertRes.Error
+	}
+	alreadyExisted := insertRes.RowsAffected == 0
+
+	// 读回持久化的行，避免依赖 gorm 的 AutoIncrement 回填在冲突分支不确定的行为。
+	var stored GrantLedger
+	if err := tx.WithContext(ctx).
+		Where("external_ref = ?", entry.ExternalRef).
+		First(&stored).Error; err != nil {
+		return nil, alreadyExisted, err
+	}
+	return &stored, alreadyExisted, nil
+}
diff --git a/internal/model/lottery/grant_ledger_test.go b/internal/model/lottery/grant_ledger_test.go
new file mode 100644
index 0000000..48ee40d
--- /dev/null
+++ b/internal/model/lottery/grant_ledger_test.go
@@ -0,0 +1,112 @@
+package lottery
+
+import (
+	"context"
+	"testing"
+
+	"github.com/DATA-DOG/go-sqlmock"
+	"gorm.io/gorm"
+)
+
+func TestLedgerService_Reserve_FirstInsertNotExisted(t *testing.T) {
+	db, mock, cleanup := newLotteryTestDB(t)
+	defer cleanup()
+
+	svc := NewLedgerService()
+
+	mock.ExpectBegin()
+	mock.ExpectExec("INSERT INTO `lottery_grant_ledger`").
+		WillReturnResult(sqlmock.NewResult(7, 1))
+	mock.ExpectQuery("FROM `lottery_grant_ledger`").
+		WithArgs("lottery:100:200", 1).
+		WillReturnRows(sqlmock.NewRows([]string{"id", "external_ref", "handler_type", "user_id", "activity_id", "draw_id", "amount"}).
+			AddRow(int64(7), "lottery:100:200", "vpn_duration", int64(42), int64(100), int64(200), int64(3)))
+	mock.ExpectCommit()
+
+	err := db.Transaction(func(tx *gorm.DB) error {
+		row, existed, e := svc.Reserve(context.Background(), tx, GrantLedger{
+			ExternalRef: "lottery:100:200",
+			HandlerType: "vpn_duration",
+			UserId:      42,
+			ActivityId:  100,
+			DrawId:      200,
+			Amount:      3,
+		})
+		if e != nil {
+			return e
+		}
+		if existed {
+			t.Fatalf("expected not existed")
+		}
+		if row.Id != 7 {
+			t.Fatalf("expected reloaded id=7, got %d", row.Id)
+		}
+		return nil
+	})
+	if err != nil {
+		t.Fatalf("tx: %v", err)
+	}
+	if err := mock.ExpectationsWereMet(); err != nil {
+		t.Fatalf("expectations: %v", err)
+	}
+}
+
+func TestLedgerService_Reserve_DuplicateExisted(t *testing.T) {
+	db, mock, cleanup := newLotteryTestDB(t)
+	defer cleanup()
+
+	svc := NewLedgerService()
+
+	mock.ExpectBegin()
+	mock.ExpectExec("INSERT INTO `lottery_grant_ledger`").
+		WillReturnResult(sqlmock.NewResult(0, 0)) // conflict, 0 rows affected
+	mock.ExpectQuery("FROM `lottery_grant_ledger`").
+		WithArgs("lottery:100:200", 1).
+		WillReturnRows(sqlmock.NewRows([]string{"id", "external_ref", "handler_type", "user_id", "activity_id", "draw_id", "amount"}).
+			AddRow(int64(9), "lottery:100:200", "vpn_duration", int64(42), int64(100), int64(200), int64(3)))
+	mock.ExpectCommit()
+
+	err := db.Transaction(func(tx *gorm.DB) error {
+		row, existed, e := svc.Reserve(context.Background(), tx, GrantLedger{
+			ExternalRef: "lottery:100:200",
+			HandlerType: "vpn_duration",
+		})
+		if e != nil {
+			return e
+		}
+		if !existed {
+			t.Fatalf("expected existed=true when INSERT returns 0 rows affected")
+		}
+		if row.Id != 9 {
+			t.Fatalf("expected stored id=9, got %d", row.Id)
+		}
+		return nil
+	})
+	if err != nil {
+		t.Fatalf("tx: %v", err)
+	}
+	if err := mock.ExpectationsWereMet(); err != nil {
+		t.Fatalf("expectations: %v", err)
+	}
+}
+
+func TestLedgerService_Reserve_RequiresTx(t *testing.T) {
+	svc := NewLedgerService()
+	if _, _, err := svc.Reserve(context.Background(), nil, GrantLedger{ExternalRef: "x"}); err == nil {
+		t.Fatalf("expected error when tx is nil")
+	}
+}
+
+func TestLedgerService_Reserve_RequiresExternalRef(t *testing.T) {
+	db, _, cleanup := newLotteryTestDB(t)
+	defer cleanup()
+
+	svc := NewLedgerService()
+	err := db.Transaction(func(tx *gorm.DB) error {
+		_, _, e := svc.Reserve(context.Background(), tx, GrantLedger{})
+		return e
+	})
+	if err == nil {
+		t.Fatalf("expected error on empty ExternalRef")
+	}
+}
diff --git a/internal/model/lottery/registry.go b/internal/model/lottery/registry.go
index c5ebf80..f7664ca 100644
--- a/internal/model/lottery/registry.go
+++ b/internal/model/lottery/registry.go
@@ -14,6 +14,8 @@ type defaultRegistry struct {
 }
 
 // NewRegistry 返回空的默认注册表。使用 Register 挂接实现。
+// 实际业务 handler（vpn_duration / commission）在 internal/logic/lottery/handler 里，
+// 由 initialize 阶段注入（避免 model 层反向依赖 logic 层）。
 func NewRegistry() *defaultRegistry {
 	return &defaultRegistry{handlers: make(map[string]PrizeHandler, 8)}
 }
@@ -39,11 +41,7 @@ func (r *defaultRegistry) MustGet(prizeType string) (PrizeHandler, error) {
 	return nil, ErrHandlerNotRegistered
 }
 
-// ---- Stage 1 骨架 handler --------------------------------------------------
-// 真实业务对接在架构师 review 骨架 PR 之后 Day 2-3 补齐。此时命中真实
-// handler 会返回 ErrNotImplemented，让抽奖流程整笔事务回滚，避免误发。
-
-// noopHandler 是"谢谢参与"。写记录、不发放，不需要真实业务对接。
+// noopHandler 是"谢谢参与"，永远归 model 层：不依赖任何业务，最小占位。
 type noopHandler struct{}
 
 // NewNoopHandler 返回 PrizeTypeNone 的 handler。
@@ -55,40 +53,3 @@ func (noopHandler) Dispatch(_ context.Context, _ *gorm.DB, _ DispatchRequest) (D
 	return DispatchResult{State: DispatchStateAutoClaimed, Message: "谢谢参与"}, nil
 }
 func (noopHandler) ValidateClaim(_ []byte) error { return nil }
-
-// vpnDurationStubHandler 是订阅时长发放的占位 handler。
-// Day 2-3 需替换为真实实现：
-//  1. tx 内 SELECT ... FOR UPDATE 锁 lottery_grant_ledger UNIQUE(external_ref)
-//  2. 命中 → 幂等返回；未命中 → INSERT ledger + 调用 UserModel.UpdateSubscribe/InsertSubscribe
-//  3. external_ref 用 fmt.Sprintf("lottery:%d:%d", req.ActivityId, req.DrawId)
-//  4. 家庭组场景通过 commonLogic.ResolveEntitlementUser 归位到 owner
-//  5. 成功后 best-effort 调 NodeModel.ClearServerAllCache + 用户组重算
-type vpnDurationStubHandler struct{}
-
-// NewVPNDurationStubHandler 返回 PrizeTypeVPNDuration 的骨架 handler。
-func NewVPNDurationStubHandler() PrizeHandler { return &vpnDurationStubHandler{} }
-
-func (vpnDurationStubHandler) Type() string { return PrizeTypeVPNDuration }
-func (vpnDurationStubHandler) IsAuto() bool { return true }
-func (vpnDurationStubHandler) Dispatch(_ context.Context, _ *gorm.DB, _ DispatchRequest) (DispatchResult, error) {
-	return DispatchResult{}, ErrNotImplemented
-}
-func (vpnDurationStubHandler) ValidateClaim(_ []byte) error { return nil }
-
-// commissionStubHandler 是佣金入账的占位 handler。
-// Day 2-3 需替换为真实实现：
-//  1. tx 内 lottery_grant_ledger 幂等检查
-//  2. 调 UserModel.UpdateCommission + common.WriteCommissionLog（同 tx）
-//  3. 建议新增 log.CommissionTypeLottery 常量（数值待架构师批），
-//     避免把抽奖入账混进 Purchase/Renewal 类型统计
-type commissionStubHandler struct{}
-
-// NewCommissionStubHandler 返回 PrizeTypeCommission 的骨架 handler。
-func NewCommissionStubHandler() PrizeHandler { return &commissionStubHandler{} }
-
-func (commissionStubHandler) Type() string { return PrizeTypeCommission }
-func (commissionStubHandler) IsAuto() bool { return true }
-func (commissionStubHandler) Dispatch(_ context.Context, _ *gorm.DB, _ DispatchRequest) (DispatchResult, error) {
-	return DispatchResult{}, ErrNotImplemented
-}
-func (commissionStubHandler) ValidateClaim(_ []byte) error { return nil }
diff --git a/internal/model/lottery/registry_test.go b/internal/model/lottery/registry_test.go
index 6fc300c..aa5f70c 100644
--- a/internal/model/lottery/registry_test.go
+++ b/internal/model/lottery/registry_test.go
@@ -21,17 +21,13 @@ func TestRegistry_GetMissing(t *testing.T) {
 func TestRegistry_RegisterAndGet(t *testing.T) {
 	r := NewRegistry()
 	r.Register(NewNoopHandler())
-	r.Register(NewVPNDurationStubHandler())
-	r.Register(NewCommissionStubHandler())
 
-	for _, want := range []string{PrizeTypeNone, PrizeTypeVPNDuration, PrizeTypeCommission} {
-		h, err := r.MustGet(want)
-		if err != nil {
-			t.Fatalf("MustGet(%q): %v", want, err)
-		}
-		if h.Type() != want {
-			t.Fatalf("Type mismatch: want %q got %q", want, h.Type())
-		}
+	h, err := r.MustGet(PrizeTypeNone)
+	if err != nil {
+		t.Fatalf("MustGet(%q): %v", PrizeTypeNone, err)
+	}
+	if h.Type() != PrizeTypeNone {
+		t.Fatalf("Type mismatch: want %q got %q", PrizeTypeNone, h.Type())
 	}
 }
 
@@ -48,12 +44,3 @@ func TestNoopHandler_AlwaysAutoClaimed(t *testing.T) {
 		t.Fatalf("noop should dispatch as auto_claimed, got %q", res.State)
 	}
 }
-
-func TestStubHandlers_ReturnNotImplemented(t *testing.T) {
-	for _, h := range []PrizeHandler{NewVPNDurationStubHandler(), NewCommissionStubHandler()} {
-		_, err := h.Dispatch(context.Background(), (*gorm.DB)(nil), DispatchRequest{})
-		if !errors.Is(err, ErrNotImplemented) {
-			t.Fatalf("%s: expected ErrNotImplemented, got %v", h.Type(), err)
-		}
-	}
-}
diff --git a/internal/model/lottery/service.go b/internal/model/lottery/service.go
index fcacf2e..94eaf43 100644
--- a/internal/model/lottery/service.go
+++ b/internal/model/lottery/service.go
@@ -79,6 +79,10 @@ type DispatchRequest struct {
 	DrawId     int64
 	Prize      Prize         // 当前奖品（含 Config JSON）
 	Snapshot   PrizeSnapshot // 抽奖时刻快照
+	// IdempotencyKey 是 lottery_grant_ledger.external_ref 的最终值。
+	// 调用方（抽奖服务）负责生成，惯例 = fmt.Sprintf("lottery:%d:%d", ActivityId, DrawId)。
+	// 每次 Dispatch 用同一 IdempotencyKey 重试 → handler 命中 ledger UNIQUE 返回原结果。
+	IdempotencyKey string
 }
 
 // DispatchResult 是发奖结果。
diff --git a/internal/svc/serviceContext.go b/internal/svc/serviceContext.go
index 168b626..fcf0e36 100644
--- a/internal/svc/serviceContext.go
+++ b/internal/svc/serviceContext.go
@@ -11,6 +11,7 @@ import (
 	"github.com/perfect-panel/server/pkg/storage"
 
 	"github.com/perfect-panel/server/internal/config"
+	lotteryhook "github.com/perfect-panel/server/internal/logic/lottery/hook"
 	"github.com/perfect-panel/server/internal/model/ads"
 	"github.com/perfect-panel/server/internal/model/announcement"
 	"github.com/perfect-panel/server/internal/model/auth"
@@ -19,6 +20,7 @@ import (
 	iapapple "github.com/perfect-panel/server/internal/model/iap/apple"
 	"github.com/perfect-panel/server/internal/model/log"
 	logmessage "github.com/perfect-panel/server/internal/model/logmessage"
+	"github.com/perfect-panel/server/internal/model/lottery"
 	"github.com/perfect-panel/server/internal/model/order"
 	"github.com/perfect-panel/server/internal/model/payment"
 	"github.com/perfect-panel/server/internal/model/promo"
@@ -71,6 +73,11 @@ type ServiceContext struct {
 	AnnouncementModel        announcement.Model
 	IAPAppleTransactionModel iapapple.Model
 
+	// Lottery (Stage 1)
+	LotteryChance     lottery.ChanceService
+	LotteryLedger     lottery.LedgerService
+	LotteryInviteHook lotteryhook.InviteHook
+
 	Restart               func() error
 	TelegramBot           *tgbotapi.BotAPI
 	NodeMultiplierManager *nodeMultiplier.Manager
@@ -148,6 +155,11 @@ func NewServiceContext(c config.Config) *ServiceContext {
 	}
 	srv.IAPAppleTransactionModel = iapapple.NewModel(db, rds)
 	srv.DeviceManager = NewDeviceManager(srv)
+	// Lottery Stage 1: wire the always-safe pieces (ChanceService, LedgerService,
+	// InviteHook). PrizeHandler registry is created in the draw service (PR C).
+	srv.LotteryChance = lottery.NewChanceService(db)
+	srv.LotteryLedger = lottery.NewLedgerService()
+	srv.LotteryInviteHook = lotteryhook.NewInviteHook(db, srv.LotteryChance)
 	if c.S3.Enable {
 		s3Store, err := storage.NewS3Store(context.Background(), c.S3)
 		if err != nil {
diff --git a/queue/logic/order/activateOrderLogic.go b/queue/logic/order/activateOrderLogic.go
index 6bc4005..ae19355 100644
--- a/queue/logic/order/activateOrderLogic.go
+++ b/queue/logic/order/activateOrderLogic.go
@@ -1127,6 +1127,11 @@ func (l *ActivateOrderLogic) handleCommission(ctx context.Context, userInfo *use
 		// 普通用户路径（佣金比例=0）：只有首单才双方赠N天
 		if orderInfo.IsNew {
 			l.grantGiftDaysToBothParties(ctx, userInfo, orderInfo)
+			// 抽奖钩子（Stage 1）：首单成功即算邀请转化，即便本笔无佣金。
+			// referer 通过 userInfo.RefererId 定位，orderNo 作幂等键。
+			if userInfo != nil {
+				l.invokeInviteHookIfEligible(ctx, userInfo.RefererId, orderInfo)
+			}
 		}
 		return
 	}
@@ -1214,6 +1219,11 @@ func (l *ActivateOrderLogic) handleCommission(ctx context.Context, userInfo *use
 		)
 	}
 
+	// 抽奖钩子（Stage 1）：仅新购激活时触发（IsNew）。续费走留存路径不再发放
+	// 机会，避免注册后弃号刷奖的黑产。branch B 内不再显式判 IsNew，全部通过
+	// invokeInviteHookIfEligible 收拢，语义唯一入口。
+	l.invokeInviteHookIfEligible(ctx, referer.Id, orderInfo)
+
 	// 有佣金路径：邀请人拿佣金，被邀请用户（首单）拿天数
 	if orderInfo.IsNew {
 		giftTarget := l.resolveGiftTargetUser(ctx, userInfo, orderInfo.SubscriptionUserId)
@@ -1223,6 +1233,22 @@ func (l *ActivateOrderLogic) handleCommission(ctx context.Context, userInfo *use
 	}
 }
 
+// invokeInviteHookIfEligible 是抽奖邀请钩子的唯一入口。所有 handleCommission
+// 分支都通过它触发，避免"这里加了 IsNew 判断，那里忘了"的漂移。
+//
+// 门槛：仅在 orderInfo.IsNew=true（新购首次激活）时触发 —— 这是架构师锁定
+// 的"首次付款激活"决策。续费是留存事件而非转化事件，不发放抽奖机会（否则
+// 会催生注册后弃号刷奖的黑产）。
+func (l *ActivateOrderLogic) invokeInviteHookIfEligible(ctx context.Context, refererID int64, orderInfo *order.Order) {
+	if l.svc == nil || l.svc.LotteryInviteHook == nil || orderInfo == nil {
+		return
+	}
+	if !orderInfo.IsNew {
+		return
+	}
+	l.svc.LotteryInviteHook.OnConversion(ctx, refererID, orderInfo.OrderNo)
+}
+
 func (l *ActivateOrderLogic) grantGiftDaysToBothParties(ctx context.Context, referee *user.User, orderInfo *order.Order) {
 	giftDays := l.svc.Config.Invite.GiftDays
 	if giftDays <= 0 || referee == nil || referee.Id == 0 || referee.RefererId == 0 || orderInfo == nil {
diff --git a/queue/logic/order/invite_hook_gate_test.go b/queue/logic/order/invite_hook_gate_test.go
new file mode 100644
index 0000000..fa87212
--- /dev/null
+++ b/queue/logic/order/invite_hook_gate_test.go
@@ -0,0 +1,100 @@
+package orderLogic
+
+import (
+	"context"
+	"sync"
+	"testing"
+
+	lotteryhook "github.com/perfect-panel/server/internal/logic/lottery/hook"
+	"github.com/perfect-panel/server/internal/model/order"
+	"github.com/perfect-panel/server/internal/svc"
+)
+
+// recordingInviteHook 记录每次 OnConversion 调用，让测试直接断言时序与参数。
+type recordingInviteHook struct {
+	mu    sync.Mutex
+	calls []recordingInviteCall
+}
+
+type recordingInviteCall struct {
+	refererID int64
+	orderNo   string
+}
+
+func (h *recordingInviteHook) OnConversion(_ context.Context, refererID int64, orderNo string) {
+	h.mu.Lock()
+	defer h.mu.Unlock()
+	h.calls = append(h.calls, recordingInviteCall{refererID: refererID, orderNo: orderNo})
+}
+
+// verify recordingInviteHook satisfies the interface at compile time.
+var _ lotteryhook.InviteHook = (*recordingInviteHook)(nil)
+
+func (h *recordingInviteHook) snapshot() []recordingInviteCall {
+	h.mu.Lock()
+	defer h.mu.Unlock()
+	out := make([]recordingInviteCall, len(h.calls))
+	copy(out, h.calls)
+	return out
+}
+
+func newLotteryHookTestLogic(hook lotteryhook.InviteHook) *ActivateOrderLogic {
+	return NewActivateOrderLogic(&svc.ServiceContext{LotteryInviteHook: hook})
+}
+
+// TestInvokeInviteHook_FiresOnFirstPurchase 保证新购激活会触发抽奖钩子。
+// Positive-path regression matched against the "首次付款激活" decision.
+func TestInvokeInviteHook_FiresOnFirstPurchase(t *testing.T) {
+	hook := &recordingInviteHook{}
+	logic := newLotteryHookTestLogic(hook)
+
+	logic.invokeInviteHookIfEligible(context.Background(), 42, &order.Order{
+		OrderNo: "ORD-NEW-1",
+		IsNew:   true,
+	})
+
+	calls := hook.snapshot()
+	if len(calls) != 1 {
+		t.Fatalf("expected exactly 1 OnConversion call on first purchase, got %+v", calls)
+	}
+	if calls[0].refererID != 42 || calls[0].orderNo != "ORD-NEW-1" {
+		t.Fatalf("wrong args: %+v", calls[0])
+	}
+}
+
+// TestInvokeInviteHook_DoesNotFireOnRenewal 是架构师 R1 打回的关键回归：
+// 续费付款必须 NOT 触发抽奖钩子，否则 referer 每月拿一次白嫖机会，与"首次
+// 付款激活"决策相悖。
+func TestInvokeInviteHook_DoesNotFireOnRenewal(t *testing.T) {
+	hook := &recordingInviteHook{}
+	logic := newLotteryHookTestLogic(hook)
+
+	logic.invokeInviteHookIfEligible(context.Background(), 42, &order.Order{
+		OrderNo: "ORD-RENEWAL-1",
+		IsNew:   false,
+	})
+
+	if calls := hook.snapshot(); len(calls) != 0 {
+		t.Fatalf("renewal must NOT trigger invite hook; got %+v", calls)
+	}
+}
+
+// TestInvokeInviteHook_NilOrderIsSafe 保证空 order 输入不 panic（防御性）。
+func TestInvokeInviteHook_NilOrderIsSafe(t *testing.T) {
+	hook := &recordingInviteHook{}
+	logic := newLotteryHookTestLogic(hook)
+	logic.invokeInviteHookIfEligible(context.Background(), 42, nil)
+	if calls := hook.snapshot(); len(calls) != 0 {
+		t.Fatalf("nil order must be a no-op; got %+v", calls)
+	}
+}
+
+// TestInvokeInviteHook_NilHookIsSafe 保证 ServiceContext 里没接线时不 panic。
+func TestInvokeInviteHook_NilHookIsSafe(t *testing.T) {
+	logic := NewActivateOrderLogic(&svc.ServiceContext{}) // no LotteryInviteHook
+	logic.invokeInviteHookIfEligible(context.Background(), 42, &order.Order{
+		OrderNo: "ORD-1",
+		IsNew:   true,
+	})
+	// If we got here without panicking, we pass.
+}