draft

backend/internal/model/service_fee.go

@@ -0,0 +1,56 @@
+package model
+
+import "time"
+
+// PayMethodGroup 支付方式分组（用于服务费配置）
+type PayMethodGroup string
+
+const (
+	PayMethodGroupScan     PayMethodGroup = "SCAN"     // 扫码支付（微信/支付宝）
+	PayMethodGroupTransfer PayMethodGroup = "TRANSFER" // 对公转账
+	PayMethodGroupBalance  PayMethodGroup = "BALANCE"  // 余额支付
+)
+
+// ServiceFeeConfig 服务费配置
+type ServiceFeeConfig struct {
+	ID                    uint64         `gorm:"column:id;primaryKey;autoIncrement"`
+	AppID                 string         `gorm:"column:app_id;size:32;not null;uniqueIndex:uk_app_method"`
+	PayMethodGroup        PayMethodGroup `gorm:"column:pay_method_group;size:20;not null;uniqueIndex:uk_app_method"`
+	FeeRate               float64        `gorm:"column:fee_rate;type:decimal(6,4);not null"` // 0.0000 ~ 9.9999%
+	FeeReceiverMerchantID string         `gorm:"column:fee_receiver_merchant_id;size:64;not null"`
+	Status                int8           `gorm:"column:status;not null;default:1"`
+	CreatedAt             time.Time      `gorm:"column:created_at;autoCreateTime:milli"`
+	UpdatedAt             time.Time      `gorm:"column:updated_at;autoUpdateTime:milli"`
+}
+
+func (ServiceFeeConfig) TableName() string { return "service_fee_config" }
+
+// ServiceFeeLog 服务费流水
+type ServiceFeeLog struct {
+	ID                   uint64    `gorm:"column:id;primaryKey;autoIncrement"`
+	TradeNo              string    `gorm:"column:trade_no;size:32;not null;uniqueIndex:uk_trade_action"`
+	ConfigID             uint64    `gorm:"column:config_id;not null"`
+	FeeAmount            int64     `gorm:"column:fee_amount;not null"`
+	FeeRate              float64   `gorm:"column:fee_rate;type:decimal(6,4);not null"`
+	ReceiverMerchantID   string    `gorm:"column:receiver_merchant_id;size:64;not null"`
+	Action               string    `gorm:"column:action;size:20;not null;uniqueIndex:uk_trade_action"` // CHARGE / ROLLBACK
+	Status               string    `gorm:"column:status;size:20;not null;default:PENDING"`
+	ChannelSharingNo     string    `gorm:"column:channel_sharing_no;size:64"`
+	CreatedAt            time.Time `gorm:"column:created_at;autoCreateTime:milli"`
+	UpdatedAt            time.Time `gorm:"column:updated_at;autoUpdateTime:milli"`
+}
+
+func (ServiceFeeLog) TableName() string { return "service_fee_log" }
+
+// PayMethodToGroup 将支付方式映射到服务费分组
+func PayMethodToGroup(m PayMethod) PayMethodGroup {
+	switch m {
+	case PayMethodWechatJSAPI, PayMethodWechatH5, PayMethodWechatNative,
+		PayMethodWechatMini, PayMethodAlipay, PayMethodQuickPay:
+		return PayMethodGroupScan
+	case PayMethodTransfer:
+		return PayMethodGroupTransfer
+	default:
+		return PayMethodGroupBalance
+	}
+}