Failed to check the signature of the docking payment interface?

problem description

when interfacing with the payment interface, the parameters are encrypted with the private key. The platform uses our public key to verify the signature, and their demo verification is successful. However, after sending the post request, the return verification fails.

the environmental background of the problems and what methods you have tried

confirmed that there is no problem with the public key.
communicated with the platform personnel, saying that the request id, signature field in the parameters received over there has all changed.

related codes

/ / Please paste the code text below (do not replace the code with pictures)

return information: {"msg": "signature verification failed", "code": "SXF0005", "reqId": "20180828-161110381"}

what result do you expect? What is the error message actually seen?

May.08,2021
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-7be110-26fda.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-7be110-26fda.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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