Hi @jimfr

Yes that’s possible with a little custom coding. Please copy and paste the following snippet into your theme’s functions.php file – at the bottom of it.

function pno_validate_zipcode( $fields ) {

	if ( isset( $fields['listing_zipcode'] ) ) {

		$max       = 5;
		$message   = 'Your error message goes here';
		$validator = new PNO\Validator\LessThanEqual( $max, $message );

		$fields['listing_zipcode']['validators'] = $validator;

	}

	return $fields;

}
add_filter( 'pno_listing_submission_form_fields', 'pno_validate_zipcode' );
add_filter( 'pno_listing_editing_form_fields', 'pno_validate_zipcode' );

You should also customize the error message within the $message variable.

Hope this helps 🙂