diff --git a/xy_sh/internal/biz/biz.go b/xy_sh/internal/biz/biz.go
new file mode 100644
index 0000000..a3c86fb
--- /dev/null
+++ b/xy_sh/internal/biz/biz.go
@@ -0,0 +1,57 @@
+package biz
+
+import (
+	"xy_sh/internal/entities"
+)
+
+// Biz 业务逻辑接口
+type Biz interface {
+	// CreateOrder 卡券/直充权益下单
+	CreateOrder(req *entities.OrderCreateBizReq) (*entities.OrderCreateBizResp, error)
+	// QueryOrder 卡券/直充/微信立减金订单查询
+	QueryOrder(req *entities.OrderQueryBizReq) (*entities.OrderQueryBizResp, error)
+	// WechatRecharge 微信立减金订单充值
+	WechatRecharge(req *entities.WechatRechargeBizReq) (*entities.WechatRechargeBizResp, error)
+	// ProcessCallback 处理回调通知
+	ProcessCallback(req *entities.CallbackNotifyBizReq) error
+}
+
+type bizImpl struct{}
+
+// NewBiz 创建业务逻辑实例
+func NewBiz() Biz {
+	return &bizImpl{}
+}
+
+func (b *bizImpl) CreateOrder(req *entities.OrderCreateBizReq) (*entities.OrderCreateBizResp, error) {
+	// TODO: 实现下单业务逻辑
+	return &entities.OrderCreateBizResp{
+		OrderNo: "HM" + generateOrderNo(),
+		Status:  -1,
+	}, nil
+}
+
+func (b *bizImpl) QueryOrder(req *entities.OrderQueryBizReq) (*entities.OrderQueryBizResp, error) {
+	// TODO: 实现订单查询业务逻辑
+	return &entities.OrderQueryBizResp{
+		OrderNo: req.OrderNo,
+		Status:  0,
+	}, nil
+}
+
+func (b *bizImpl) WechatRecharge(req *entities.WechatRechargeBizReq) (*entities.WechatRechargeBizResp, error) {
+	// TODO: 实现微信立减金充值业务逻辑
+	return &entities.WechatRechargeBizResp{
+		OrderNo: req.OrderNo,
+		Status:  -1,
+	}, nil
+}
+
+func (b *bizImpl) ProcessCallback(req *entities.CallbackNotifyBizReq) error {
+	// TODO: 处理回调通知业务逻辑
+	return nil
+}
+
+func generateOrderNo() string {
+	return "ORDERNO"
+}
\ No newline at end of file