?'; add_meta_box( 'airwpsync-mapping', __( 'Field Mapping', 'air-wp-sync' ) . $tooltip_html, array( $this, 'display' ), 'airwpsync-connection', 'normal', 'high' ); } /** * Output metabox HTML */ public function display() { $mapping_validation_rules = apply_filters( 'airwpsync/mapping_validation_rules', array( 'required' ) ); include_once AIR_WP_SYNC_PLUGIN_DIR . 'views/metabox-mapping.php'; } /** * Add required mapping rule to mapping rules */ public function add_mapping_validation_rules( $rules ) { $rules[] = 'mappingRequired'; return $rules; } }