商户平台证书如何更换？

data:image/jpeg;base64,eyJlcnJjb2RlIjo0MDAwMSwiZXJybXNnIjoiaW52YWxpZCBjcmVkZW50aWFsLCBhY2Nlc3NfdG9rZW4gaXMgaW52YWxpZCBvciBub3QgbGF0ZXN0IHJpZDogNjBhMzhiMjEtNzM1MWIyNjMtMmM2ZDAxNjkifQ== 以上是接口返回结果，是偶然出现的