微信特约商户进件 一直显示签名错误 https://api.mch.weixin.qq.com/v3/applyment4sub/applyment/；

{"code":"SIGN_ERROR","detail":{"detail":{"issue":"sign not match"},"field":"signature","location":"authorization","sign_information":{"method":"POST","sign_message_length":108,"truncated_sign_message":"POST\n/v3/applyment4sub/applyment/\n1581149566\n51200c85b04a45e488f5afac5f49ddb1\n{\"busine\n","url":"/v3/applyment4sub/applyment/"}},"message":"错误的签名，验签失败"}