1.商户号操作升级证书，升级为权威CA颁发的API证书，拿到apiclient_cert.p12文件。

2.代码没改，直接替换原来的apiclient_cert.p12。

3.退款失败，抛出异常

Caused by: java.security.UnrecoverableKeyException: failed to decrypt safe contents entry: javax.crypto.BadPaddingException: Given final block not properly padded. Such issues can arise if a bad key is used during decryption.

ps：用原来的老证书没这个问题