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为了保证安全性,微信支付在 回调通知和平台证书下载接口中,对关键信息进行了AES-256-GCM加密。API V3密钥是加密时使用的对称密钥。
AES-256-GCM
商户需先在【商户平台】->【API安全】的页面设置该密钥,请求才能通过微信支付的签名校验。密钥的长度为32个字节。
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