Make other Billing Fields required

If you’re need to make the ZIP / Postal Code or the State / Province fields required in your form, you can do this with some custom code:

add_filter( 'pms_inv_get_invoice_fields', 'pmsc_require_billing_fields' );
function pmsc_require_billing_fields( $fields ){

    if( isset( $fields['pms_billing_state'] ) )
        $fields['pms_billing_state']['required'] = 1;
        
    if( isset( $fields['pms_billing_zip'] ) )
        $fields['pms_billing_zip']['required'] = 1;
        
    return $fields;
    
}

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