curl https://auth.smartcar.com/oauth/token \
  -X POST \
  -H 'Authorization: Basic base64({client_id}:{client_secret})' \
  -H 'Content-Type: application/x-www-form-urlencoded' \
  -d 'grant_type=refresh_token&refresh_token=3e565aed-d4b2-4296-9b4c-aec35825a6aa'

  new_access = client.exchange_refresh_token('{refreshToken}')

  newAccess = client.exchangeRefreshToken('{refreshToken}');

  Auth newAccess = authClient.exchangeRefreshToken('{refreshToken}');

  new_access = client.exchange_refresh_token("{refresh_token}")

{
  "access_token": "cf7ba7e9-8c5d-417d-a99f-c386cfc235cc",
  "token_type": "Bearer",
  "expires_in": 7200,
  "refresh_token": "58b128ba-8e44-11ee-b9d1-0242ac120002"
}