How to verify the content of WeChat payment result notification by signature?

Sign is a signature, which is something that is encrypted with md5 after the data you submit has been set and combined by certain rules (the official document introduces it). Used to verify whether the data has been tampered with by a third party. You send it to the WeChat server, and the WeChat server will generate a flag with the parameters you send. Compare it with the sign you sent.

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