API V3 Key
Update Time:2025.01.061. API V3 Key
To ensure security, WeChat Pay uses AES-256-GCM
encryption for key information in the callback notification and platform certificate download API. API V3 key is a symmetric key used in encryption.
Merchants need to set the key in Merchant Platform > API Security so that the request can pass the signature verification of WeChat Pay. The length of the key is 32 bytes.
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