客户凭证授权
POST /token HTTP/1.1
Host: server.example.com
Content-Type: application/x-www-form-urlencoded
grant_type=client_credentials&client_id=[APP_KEY]&client_secret=[APP_SECRET]
POST /token HTTP/1.1
Host: server.example.com
Content-Type: application/x-www-form-urlencoded
grant_type=client_credentials&client_id=[APP_KEY]&client_secret=[APP_SECRET]