curl --location --request POST '/user/auth/oauth2/token?grant_type=client_credentials&api_key=&api_secret&refresh_token' \ --header 'Content-Type: multipart/form-data'
{ "retcode": "200", "retdata": { "access_token": "Cji8NYO32ugrFJJkG7uCYiX2", "token_type": "bearer", "expires_in": 21600, "refresh_token": "C6k8Vqytb4S8x41RUdMNqzG1", "rt_expires_in": 43200 } }