Revolut Gateway for WHMCS allows you to accept credit card payments via Revolut in WHMCS. In order to use this payment gateway you need a Revolut Merchant account.
Revolut Merchant is a brilliant and cheaper alternative to Stripe, which was launched in December 2020. You can find more information about Revolut Merchant at: revolut.com/business/help/merchant-accounts
Documentation for this module is available here.