Hello,
Thanks for your message. We suggest getting in touch with our team through our website for questions related to the Pro/commercial version of the plugin. Options/extra services are not available in the free version of the plugin, and so in order to not go off-topic on this forum, we suggest getting in touch with us through our website or by opening a support ticket. Thank you!
The error with code 403 (Forbidden) is probably caused by a third-party plugin, or by some security rules in place on your server. That error message has got nothing to do with VikRentCar, it’s usually a firewall rule or a security plugin that intercepts requests containing PHP code.
Also, Options/Extras can be configured as “mandatory”, by turning on the parameter “Always selected”. You may not need to modify the PHP code, and if you needed to do so, then editing a PHP core file is strongly discouraged, or you will lose your changes by installing the next official plugin update. It would be even worse if you decided to keep an old version for a customization that was not done properly. In fact, the step #3 of the booking process is a “View” (page) that can be overridden. Thanks to the overrides technique, you will be able to work on a cloned copy of the original template file of a specific “View” of the plugin.
Overrides can be created manually by following the technical documentation on our website, or you can just use the “Overrides Manager” tool available in the Configuration page of VikRentCar.
This way you will not apply any changes to core files, and you will always be able to install future updates without losing your customization.
We hope this helps!
The VikWP Team