优化结构

internal/biz/payment/payment.go

@@ -388,12 +388,8 @@ func NewPaymentUsecase(repo PaymentRepo, orders PaymentOrderRepo, hooks PaymentH
 }
 
 func NewConfiguredPaymentUsecase(repo PaymentRepo, orders PaymentOrderRepo, hooks PaymentHooks, sources *PaymentOrderSourceRegistry, fulfillments *PaymentFulfillmentRegistry, appLogger *slog.Logger) (*PaymentUsecase, error) {
-	if sources == nil || sources.Len() == 0 {
-		return nil, errors.New("支付业务订单来源未注册，无法启动支付服务")
-	}
-	if fulfillments == nil || fulfillments.Len() == 0 {
-		return nil, errors.New("支付发货 handler 未注册，无法启动支付服务")
-	}
+	// Business modules are optional in the template. Missing modules are
+	// reported when the corresponding payment operation is invoked.
 	return NewPaymentUsecase(repo, orders, hooks, sources, fulfillments, appLogger), nil
 }
 
@@ -924,8 +920,6 @@ func (uc *PaymentUsecase) refundWithOrder(ctx context.Context, provider, tradeNo
 	message := ""
 	if providerErr != nil {
 		message = providerErr.Error()
-	} else if !accepted {
-		message = "支付平台未接受退款请求"
 	}
 	order, err = uc.orders.CompletePaymentRefundRequest(ctx, provider, tradeNo, token, accepted, message)
 	if err != nil {