gateway name in Events Manager booking email templates

add_filter('em_booking_output_placeholder','my_em_get_payment_type',1,3);

/**
* add some conditional output conditions for Events Manager bookings
* @param string $replacement
* @param object $EM_Booking
* @param string $result
*/
function my_em_get_payment_type($replacement, $EM_Booking, $result){
    if (is_object($EM_Booking)) {
        if ($result == '#_PAYMENTGATEWAY') {
            $replacement = $EM_Booking->booking_meta['gateway'];
        }
    }

    return $replacement;
}