Hello,
Thanks for your message. The check-out process of VikRentItems relies on the PHP Session, and if you do not see any items in the cart (order summary page), then it means that your PHP Session is broken by some other plugins that are sending data to output.
This is a common issue when some third-party plugins generate PHP Notice or Warning messages, maybe when the error reporting level displays errors. Alternatively, some plugins may add a white space to your pages, and this is still data that gets sent to output. If the PHP loading process of our plugin is done after data is erroneously sent to output, then your PHP Session will be broken, and so no items will be displayed in the order summary page.
By checking your server logs, you should identify any possible PHP Warning or Notice message to find the plugins responsible of the issue. Trying to temporarily disable some third-party plugins may also be helpful, even though your Theme could also be responsible of some white-spaces.
Lastly, we’ve seen issues with the WordPress configuration file wp-config.php that was erroneously modified by adding a white-space either at the beginning or at the end of the file. As stated above, any white-space or data sent to output (errors, warnings, notices) will break your PHP Session and no items will be visible in the Order Summary page.
We invite you to get in touch with the technical support team through our website in case you keep having issues.
Thank you!
The VikWP Team