public static function do_shortcode() {

		check_ajax_referer( 'pum-shortcode-ui-nonce', 'nonce' );

		$tag       = ! empty( $_REQUEST['tag'] ) ? sanitize_key( $_REQUEST['tag'] ) : false;
		$shortcode = ! empty( $_REQUEST['shortcode'] ) ? stripslashes( sanitize_text_field( $_REQUEST['shortcode'] ) ) : null;
		$post_id   = isset( $_REQUEST['post_id'] ) ? intval( $_REQUEST['post_id'] ) : null;

		if ( ! current_user_can( 'edit_post', $post_id ) ) {
			return esc_html__( "You do not have access to preview this post.", 'popup-maker' );
		}

		/** @var PUM_Shortcode $shortcode */
		$shortcode_object = PUM_Shortcodes::instance()->get_shortcode( $tag );

		if ( ! defined( 'PUM_DOING_PREVIEW' ) ) {
			define( 'PUM_DOING_PREVIEW', true );
		}

		/**
		 * Often the global $post is not set yet. Set it in case for proper rendering.
		 */
		if ( ! empty( $post_id ) ) {
			global $post;
			$post = get_post( $post_id );
			setup_postdata( $post );
		}

		/** @var string $content Rendered shortcode content. */
		$content = PUM_Helpers::do_shortcode( $shortcode );

		/** If no matching tag or $content wasn't rendered die. */
		if ( ! $shortcode_object || $content == $shortcode ) {
			wp_send_json_error();
		}

		/** Generate inline styles when needed. */
		$styles = "<style>" . $shortcode_object->get_template_styles() . "</style>";

		wp_send_json_success( $styles . $content );
	}