Hook um_core_form_meta_all

um_core_form_meta_all.php

<?php

/**
 * Hook: um_core_form_meta_all
 *
 * Type: filter
 *
 * Description: Extend UM forms meta keys.
 *
 * @example https://github.com/ultimatemember/ultimatemember/blob/master/includes/class-config.php#L230
 * @link    https://docs.ultimatemember.com/article/1087-umcoreformmetaall
 *
 * @package um
 * @see     um\Config::__construct()
 * @since   2.0
 * @version 3.0
 *
 * @param array $meta UM forms meta.
 *
 * @return array UM forms meta.
 */
function my_core_form_meta_all( $meta ) {
	// your code here.
	return $meta;
}
add_filter( 'um_core_form_meta_all', 'my_core_form_meta_all', 10, 1 );