curl --request POST \
  --url https://api.google.com/api:XUynQtIz/api/v{version}/auth/token \
  --header 'Content-Type: application/x-www-form-urlencoded' \
  --data grant_type=client_credentials \
  --data client_id=70000006 \
  --data client_secret=password \
  --data expires_in=100

{
  "token_type": "bearer",
  "expires_in": 604800,
  "access_token": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9..."
}