php development app WeChat end

Question

WeChat Pay keeps reporting an error on the app side that the payment verification signature failed. However, it was still possible to pay for the first two days. If I try to test it after two days, it will not work. The signature I generated is the same as the signature generated by the official signature generation tool. Same, I don’t know why this error is reported

Answer 1

1. No one has touched the WeChat merchant configuration

2. No one has touched the local configuration