Filter autoresponder

<?php
add_filter(
/**
 * Filter the autoresponder content
 * this can be used to add custom shortcodes
 *
 * @param $msg
 * @param $id
 * @param $payment
 *
 * @return string   content for autoresponder
 */
	'qem_autoresponder-message-content',
	function ( $msg, $id, $payment ) {
		if ( ! function_exists( 'qem_get_the_numbers' ) ) {
			return $msg;
		}
		$attending = qem_get_the_numbers( $id, $payment );
		$msg       = str_replace( '[number]', $attending, $msg );

		return $msg;
	},
	10,
	3
);