Refund for WeChat payment

Refund for payment. What is the return code below? Certificate path correct certificate readable solution {code...} refund payment problem,
The return code is as follows:
What is this?
The certificate path is correct.
Certificate readable
Solution

Array (2) {["return_code"] => string (4) "FAIL" ["return_msg"] => string (21) "certificate not match" |

Reply content:

Refund for payment,
The return code is as follows:
What is this?
The certificate path is correct.
Certificate readable
Solution

Array (2) {["return_code"] => string (4) "FAIL" ["return_msg"] => string (21) "certificate not match" |

Nothing special. If a certificate error is prompted, it must be a certificate problem. I have debugged java.

What is the framework used by the landlord to request a refund?