Common Questions
Common Questions：
| Question | Answer |
|---|---|
| invalid extra format, correct format is: {"value":"test23123"}” | Invalid additional format. The correct format should be: {"value": "test23123"} The extra parameter is of type String, and its value should be: extra="{"value": "AIRP0000001"}" |
| extra parameter signing issue | &extra={"value":"TEST243234234"} & The extra parameter signing should be like this, consistent with the string format. |
| ip address not in whitelist, please contact administrator to add whitelist | 1. Contact the operation to send the IP address to be added to the whitelist. 2. Check if the mchId is the one provided by the operation. |
| If the return value of retCode for a payment on behalf order is not equal to SUCCESS, can we consider the payment on behalf failed? | Yes, only when the status is SUCCESS can we consider the order successful |
| Is it a POST request? | Yes, the request method is POST, Content-Type is application/x-www-form-urlencoded; charset=GBK |
| Is the callback data empty because the request method is incorrect? | The callback is sent via POST, and the callback data is included in the URL. |