// Add BookingPress form after single Directorist listing content
add_filter( 'the_content', 'add_bookingpress_form_to_listing' );
function add_bookingpress_form_to_listing( $content ) {
// Only show on single Directorist listing pages
if ( function_exists('is_singular') && is_singular('at_biz_dir') ) {
// Append your BookingPress form shortcode after listing content
$form = do_shortcode('[bookingpress_form]');
$content .= '