curl -X POST "https://api.fieldnation.com/authentication/api/oauth/token" \
     -H "Content-Type: application/json" \
     -d '{
           "grant_type": "password",
           "client_id": "YOUR_CLIENT_ID",
           "client_secret": "YOUR_CLIENT_SECRET",
           "username": "YOUR_USERNAME",
           "password": "YOUR_PASSWORD"
         }'

{
  "access_token": "eyJ0eXAiOiJKV1QiLCJhbG...",
  "expires_in": 3600,
  "token_type": "Bearer",
  "scope": "basic",
  "refresh_token": "cf83e1357eefb8bdf1542850d66d8007"
}