Incluir DNI en recibo PDF

givewp_pdf_nifnie_tag.php

<?php
function givewp_pdf_nifnie_tag( $template_content, $args ) {
	$meta_keys = ['nifnie', 'dninie', 'dniniecif'];
	$buyer_info    = give_get_payment_meta_user_info( $args['donation_id'] );
	$post = get_post($args['donation_id']);
	
	if ($post->post_parent) {
		$post_id = $post->post_parent;
	} else {
		$post_id = $args['donation_id'];
	}
	
	$nifnie = '';
	foreach ($meta_keys as $key) {
        $nifnie_value = get_post_meta($post_id, $key, true);
        if (!empty($nifnie_value)) {
            $nifnie = $nifnie_value;
        }
    }
    
	$template_content = str_replace( '{nifnie}', $nifnie, $template_content );
	return $template_content;
}

add_filter( 'give_pdf_compiled_template_content', 'givewp_pdf_nifnie_tag', 900, 2 );