Where does Mini Program use the certificate in payment?

when downloading certificates in API security at merchant backend, which link is used?

Mar.01,2021

Certificate is required for refund, enterprise payment and enterprise payment query

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-64f5-1ead553-214d.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1ead553-214d.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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