feat: add admin order refund flow

Co-authored-by: multica-agent <github@multica.ai>

pkg/xerr/errCode.go

@@ -141,9 +141,12 @@ const (
 )
 
 const (
-	OrderNotExist         uint32 = 61001
-	PaymentMethodNotFound uint32 = 61002
-	OrderStatusError      uint32 = 61003
-	InsufficientOfPeriod  uint32 = 61004
-	ExistAvailableTraffic uint32 = 61005
+	OrderNotExist                 uint32 = 61001
+	PaymentMethodNotFound         uint32 = 61002
+	OrderStatusError              uint32 = 61003
+	InsufficientOfPeriod          uint32 = 61004
+	ExistAvailableTraffic         uint32 = 61005
+	OrderAlreadyRefunded          uint32 = 61006
+	OrderRefundNoSubscription     uint32 = 61007
+	OrderRefundCommissionMismatch uint32 = 61008
 )

pkg/xerr/errMsg.go

@@ -99,10 +99,13 @@ func init() {
 		UseridNotMatch:                     "Userid not match",
 
 		// Order error
-		OrderNotExist:         "Order does not exist",
-		PaymentMethodNotFound: "Payment method not found",
-		OrderStatusError:      "Order status error",
-		InsufficientOfPeriod:  "Insufficient number of period",
+		OrderNotExist:                 "Order does not exist",
+		PaymentMethodNotFound:         "Payment method not found",
+		OrderStatusError:              "Order status error",
+		InsufficientOfPeriod:          "Insufficient number of period",
+		OrderAlreadyRefunded:          "Order already refunded",
+		OrderRefundNoSubscription:     "Refund target subscription not found",
+		OrderRefundCommissionMismatch: "Refund commission source not found",
 
 		// Permission error
 		PermissionDenied: "Permission denied",