Mercanet Payment Contains Two Pages:

You can personalize the following:

The language of payment pages: please refer to Finalize card payment, indirect mode
The card form can be integrated into your website. Instead of redirecting your client after MoneyInWebInit, get the form on your server (using a simple cURL call) and integrate it on your payment page
The card payment form. You can send the CSS you need for this page by sending your CSS with a parameter, as seen on Finalize Card Payment, Indirect Mode#Request. For production, please use an HTTPS URL with a certificate. If you don't have this, we can host your CSS.

Without Custom CSS:

With Custom CSS: