If the frontend calls the backend payment API to return a timeout, what if the actual payment API succeeds in subsequent processing?

in the system, the foreground POS machine needs to call the back-end payment API. After the POS machine requests the payment interface for the first time, it has not received a return for a long time, and the timeout is treated as a failure, but the actual backend is already in processing and the final payment is successful. However, the POS machine does not know that the processing is finally successful, but it initiates a second payment request again. At this time, there will be two successful payment requests at the backend. How to optimize this situation?

Request API to-pay real-time

Mar.26,2021

1. Extend the timeout time
2. Request to query the payment result instead of waiting for

1. Determine whether the backend return has not been received for a long time because the backend has not returned or timed out or is disconnected
2. The backend processes the payment and should process it after it returns successfully

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MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b30df7-2bd50.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b30df7-2bd50.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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