def METHOD_NAME(cls):
    return [
        # The api key of the account to send from.
        'api_key',
        # The Telerivet project id.
        'project_id',
        # The id of the phone to send from, as shown on Telerivet's API page.
        'phone_id',
        # The Webhook Secret that gets posted to hq on every request
        'webhook_secret',
        # If None, ignored. Otherwise, the country code to append to numbers
        # in inbound requests if not already there.
        'country_code',
    ]