完善支付流程，实现异步事件

web/globals/shangfutong.go

@@ -233,7 +233,7 @@ type QueryTradeResp struct {
 	RefundState    int32         `json:"refundState"`
 	DrType         *string       `json:"drType"`
 	ExtParam       *string       `json:"extParam"`
-	PayTime        *int64       `json:"payTime"`
+	PayTime        *string       `json:"payTime"`
 	Subject        string        `json:"subject"`
 	TradeFee       *int64        `json:"tradeFee"`
 	CashFee        *int64        `json:"cashFee"`
@@ -443,3 +443,11 @@ const (
 	SftRefundIng    SftTradeState = "REFUND_ING"
 	SftTradeClosed  SftTradeState = "TRADE_CLOSED"
 )
+
+type SftNotifyType string
+
+var (
+	SftNotifyTypeTrade    = SftNotifyType("sft.trade.notify")
+	SftNotifyTypeRefund   = SftNotifyType("sft.refund.notify")
+	SftNotifyTypeDivision = SftNotifyType("sft.division.notify")
+)