Appointment - GOOGLE_CALENDAR_LINK custom placeholder

appointment-gcal-placeholder.php

<?php
/**
* Plugin Name: Appointment - GOOGLE_CALENDAR_LINK custom placeholder
* Description: Appointment - GOOGLE_CALENDAR_LINK custom placeholder
* Author: Ariful Islam @ WPMUDEV
* Author URI: https://premium.wpmudev.org/profile/itsarifulislam
* License: GPLv2 or later
*/

add_filter( 'appointments_notification_replacements', function( $replacement, $notification_type, $text, $r ) {

	global $appointments;


	$gcal_link = esc_url_raw( $appointments->gcal( $r->service, strtotime( $r->start, $appointments->local_time ), strtotime( $r->end, $appointments->local_time ), true, $r->address, $r->city ) );

	$other_replacement = array(
		'/\bGOOGLE_CALENDAR_LINK\b/U' 	=> $gcal_link
	);

	return $replacement = array_merge( $replacement, $other_replacement );

}, 10, 4 );