All required keys must be present

def _validate_required_settings(
		self, application_id, application_config, required_settings
	):
		"""All required keys must be present"""

		for setting_key in required_settings:
			if setting_key not in application_config.keys():
				raise ImproperlyConfigured(
					MISSING_SETTING.format(
						application_id=application_id, setting=setting_key
					)
				)