What's the difference between the V2 and V3 versions of WeChat Pay?

The difference is:

Both V2 and V3 have the following parameters:

AppID

Application secret

Merchant number PartnerID

Initial key PartnerKey

The only parameters in the V2 version are:

Pay special signature string PaySignKey

And contains a certificate file: security certificate.

The only parameters in version V3 are:

Merchant number MCHID

application number

Merchant platform login account

It contains five certificate files (certificate pkcs 12 format, certificate pem format, certificate key pem format, CA certificate and security certificate).

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