/**
* Google Plus does not allow the state parameter when making access tokens requests, so it is removed from the
* payload.
*
* @param string $grantType
* @param array $payload
*
* @return array|false
* @throws \InvalidArgumentException
*/
public function requestAccessToken($grantType = GrantTypes::AUTHORIZATION_CODE, array $payload = array())
{
Option::remove($payload, 'state');
return parent::requestAccessToken($grantType, $payload);
}
