_nicename = __( 'Confirm', 'ninja-forms' ); $this->_settings[ 'confirm_field' ][ 'field_value_format' ] = 'key'; add_filter( 'nf_sub_hidden_field_types', array( $this, 'hide_field_type' ) ); } function hide_field_type( $field_types ) { $field_types[] = $this->_name; return $field_types; } public function validate( $field, $data ) { if( false ){ $errors[] = __( 'Fields do not match.', 'ninja-forms' ); } return $errors; } }