NotificationX plugin: Custom link location for Google Analytics sourced notifications (default is homepage)

functions.php

<?php 

/**
 * NotificationX plugin: Custom link location for Google Analytics sourced notifications (default is homepage).
 *
 * @link https://gist.github.com/cliffordp/f90a50390f51e98457512a36d02f1ef3 This snippet.
 *
 * @see \NotificationX\FrontEnd\FrontEnd::link_url
 */
add_filter( 'nx_notification_link_google', function( $link, $post, $entry ){
	// !!! CHANGE THIS TO YOUR "CONTACT US" PAGE ID !!!
	$target_page_id = 88;

	/*
	error_log( 'LINK' );
	error_log( $link );
	error_log( 'POST' );
	error_log( print_r( $post, true ) );
	error_log( 'ENTRY' );
	error_log( print_r( $entry, true ) );
	*/

	$new_link = add_query_arg( [
		'utm_id' => $post['id'], // The Notification's ID.
		// Not possible as NotificationX's REST request does not include it.
		//'utm_content' => 'from_id-' . get_queried_object_id(),
		'utm_source' => 'fomo',
		'utm_medium' => 'popup',
		'utm_campaign' => 'notificationx',
	], get_permalink( $target_page_id ) );

	return esc_url_raw( $new_link );
}, 10, 3 );