To access the X-Payments Cloud admin panel for the extended set of features (like customization of the look and feel of your X-Payments Cloud payment form, management of X-Payments Cloud admin users, etc.) you need to go to the standalone version. This is possible to do from your X-Cart store Admin area.
For this purpose:
Locate the X-Payments Cloud method on the payments listing page of your store Admin area (Store Setup > Payment Methods) and choose to configure it.
On the X-Payments Cloud Settings page, use the Settings menu to access the Advanced link.
There is also a way to access your X-Payments Cloud admin panel directly (not from within your X-Cart store, but as a standalone website). For direct access to the standalone version of your X-Payments Cloud admin panel, use the URL
https://your_xpc_account.xpayments.com/admin.php replacing the part ‘your_xpc_account’ with your actual X-Payments Cloud account name.