feat: integrate unified payment and wallet refunds

backend/api/internal/logic/payment/service.go

@@ -0,0 +1,61 @@
+package payment
+
+import (
+	"context"
+	"errors"
+	"time"
+
+	"git.apinb.com/heqiapp/platforms/backend/api/internal/config"
+	"git.apinb.com/heqiapp/platforms/backend/api/internal/impl"
+	"git.apinb.com/heqiapp/platforms/backend/api/internal/models"
+	"gorm.io/gorm"
+)
+
+const (
+	StatusPending = 10
+	StatusPaid    = 23
+	StatusClosed  = 30
+)
+
+type CreateInput struct {
+	RequestNo, BusinessType, BusinessIdentity, UserIdentity string
+	Channel, PayType, Subject, OpenID                       string
+	Amount                                                  int64
+}
+
+// Create 创建幂等支付单并向渠道请求客户端调起参数。
+func Create(ctx context.Context, input CreateInput) (models.PaymentOrder, error) {
+	if input.Amount <= 0 || input.RequestNo == "" || input.BusinessIdentity == "" || input.UserIdentity == "" {
+		return models.PaymentOrder{}, gorm.ErrInvalidData
+	}
+	var existing models.PaymentOrder
+	if err := impl.DBService.Where("business_type = ? AND request_no = ?", input.BusinessType, input.RequestNo).First(&existing).Error; err == nil {
+		if existing.BusinessIdentity != input.BusinessIdentity || existing.Amount != input.Amount || existing.Channel != input.Channel || existing.PayType != input.PayType {
+			return existing, errors.New("idempotency conflict")
+		}
+		return existing, nil
+	}
+	order := models.PaymentOrder{Entity: models.Entity{Identity: models.NewIdentity(), Status: 1}, PaymentStatus: StatusPending,
+		PaymentNo: "PAY" + time.Now().Format("20060102150405.000000"), RequestNo: input.RequestNo, BusinessType: input.BusinessType,
+		BusinessIdentity: input.BusinessIdentity, UserIdentity: input.UserIdentity, MerchantIdentity: "platform", Channel: input.Channel,
+		PayType: input.PayType, Amount: input.Amount, Subject: input.Subject, ExpiresAt: time.Now().Add(time.Duration(config.Spec.Payment.ExpireMinutes) * time.Minute)}
+	args, err := createChannelOrder(ctx, order, input.OpenID)
+	if err != nil {
+		return order, err
+	}
+	order.ClientArgs = args
+	if err = impl.DBService.Create(&order).Error; err != nil {
+		return order, err
+	}
+	return order, nil
+}
+
+// PublicResponse 仅返回客户端调起支付所需的非密钥参数。
+func PublicResponse(order models.PaymentOrder) map[string]any {
+	response := map[string]any{"identity": order.Identity, "payment_no": order.PaymentNo, "payment_status": order.PaymentStatus,
+		"channel": order.Channel, "pay_type": order.PayType, "amount": order.Amount, "client_args": order.ClientArgs, "expires_at": order.ExpiresAt}
+	if order.Channel == "wechat" && order.PayType == "app" {
+		response["app_id"] = config.Spec.Payment.Wechat.AppAppID
+	}
+	return response
+}