1、The getbytoken interface is relatively special, because when the developer calls the getbytoken interface, they do not yet have the openkey and secretKey, please use the backend application's APP_ID and APP_Secretkey to generate the signature
2、The following are the common reasons for signature errors
a、The interface call domain name is incorrect
b、The request header parameters are incorrect
c、The merchant has reset the key, causing the developer to use the old key to generate the signature, it is recommended to check the authorization record in the application background to confirm whether the merchant has re-authorized
d、Secretkey has not been decrypted