add_filter( 'pmpro_gateways', array( 'PMProGateway_check', 'pmpro_gateways' ) );add_filter( 'pmpro_gateways', array( 'PMProGateway_check', 'pmpro_gateways' ) ); Source File: https://github.com/strangerstudios/paid-memberships-pro/blob/master/classes/gateways/class.pmprogateway/check.php View in Source Code