Calling the APP payment interface today, WeChat kept returning the appid and mch_id to be inconsistent, and then I was always confused, where can I find the appid for APP payment? I have been puzzled for a long time, because the official website is relatively vague, and finally I found it. Actually The appid of the APP payment is the appid of the official account.
Log in to the official account -> Development -> Basic Configuration -> Developer ID (AppID).
After searching for a long time, I finally found it, record it, and leave a message to discuss if there is any problem.
Today I tested the app payment, and I jumped a big pit. The WeChat APP payment adjusted the noncestr random string in the payment interface to be returned by the unified order interface.