FormFacebook::subscribeAppToPageEvents

protected function subscribeAppToPageEvents(): RetargetingServicesResponseFacebook
{
	return $this->getRequest()->send(array(
		'methodName' => 'leadads.event.subscribe',
		'parameters' => [
			'page_id' => $this->accountId,
			'params' => [
				'subscribed_fields' => ['leadgen'],
			]
		]
	));
}