Ativar popup usando wordpress e magnifig popup

ativar_popup_wp.php

<!-- Ativar popup -->
<script type="text/javascript">
<?php global $wp, $post;

$current_url = home_url(add_query_arg(array(),$wp->request));
// $current_url = home_url();
$meta_popup = get_post_meta($post->ID, 'popupsite', true);

?>
	//sim: liga popup nao ou '' desliga popup
	popup('<?php echo $current_url; ?>', '<?php echo $meta_popup; ?>', '<?php echo is_front_page() ?>');
</script>

magnificpopup.js

// MagnificPopupv1.1.0.js
function popup(url, start, front_page_wp){

	if (start == 'sim') {
		(function($) {
			$.magnificPopup.open({
				items: {
					src: '#modal-promo'
				},
				type: 'inline',
				preloader: false,
				modal: true,
				enableEscapeKey: false
			});

			$(document).on('click', '.popup-modal-dismiss', function (e) {
				e.preventDefault();
				$.magnificPopup.close();
			});

			$(document).on('click', '.popup-modal-participar', function (e) {
				e.preventDefault();
				$.magnificPopup.close();
					$( 'html, body' ).stop().animate({scrollTop: $("#vaga").offset().top}, 2000);
			});

		})(jQuery);
	}
}

moda.html

<!-- modal/popup html -->
      <div id="modal-promo" class="white-popup mfp-hide"">
           <img src="<?php echo get_template_directory_uri(); ?>/images/promo-inscricao-50.png" alt="Promoção 50% de desconto">
        <p><a class="btn btn-danger popup-modal-participar" href="#">Quero concorrer aos 50%</a>
        <a class="btn btn-secondary popup-modal-dismiss" href="#">Não, já participo</a>
        </p>

      </div>
<!-- modal/popup html -->