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You can verify whether a user has successfully paid a transaction by using the following two methods:

• 1. Check the value of trade_status returned in the asynchronous notification from the specific interface. To receive the asynchronous notification, you must pass in notify_url in the request.
• 2. Call the specific QUERY interface. Use alipay.acquire.overseas.query for In-store Payment transactions and check the value of alipay_trans_status. Use single_trade_query for Online Payment transactions and check the value of trade_status.

For In-store Payment transactions, the user has successfully paid if the value of trade_status or alipay_trans_status is TRADE_SUCCESS or TRADE_FINISHED. The relationship between the status are illustrated in the following figure:

For Online Payment trasnactions, the user has successfully paid if the value of trade_status is TRADE_FINISHED. The relationship between the status are illustrated in the following figure:

确认支付用户支付成功的方式有2种：

1. 1. 在支付接口（境外当面付、境外收单）请求参数中设置notify_url，根据接收到的异步通知中的trade_status（交易状态）进行判断；
2. 2. 可调用对应的查询接口返回的响应参数trade_status（交易状态）来确认是否支付成功。境外当面付查询接口为“alipay.acquire.overseas.query”，境外收单查询接口为“single_trade_query”。

境外当面付：

境外收单：