curl --request POST \
  --url https://api.talkzilla.app/v1/oauth/token \
  --header 'Content-Type: application/x-www-form-urlencoded' \
  --data grant_type=client_credentials \
  --data 'client_id=<string>' \
  --data 'client_secret=<string>' \
  --data 'scope=<string>'

{
  "access_token": "<string>",
  "token_type": "Bearer",
  "expires_in": 123,
  "scope": "<string>"
}