1. First, confirm whether the prepaid order in the background corresponds to the attribute value in the WeChat payment object PayReq.
2. Confirm the value of the symbol. The payment object in WeChat has a sing attribute, which is signature. The value of this attribute is special, and it can only be used directly after the secondary signature is completed in the background. If the secondary signature is not done in the background and needs to be done by ourselves, we need to use a method to deal with the symbol value.
3.MD5 encryption
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