Revelation Pets offers integrated credit card processing through a dedicated solution called Rev Pets Payments which is powered by Stripe. This service runs on the Stripe Custom platform. You will need to set up an account via Account Settings >> Translations >> Revelation Pets Payments. More information is available here.
If Stripe Custom is not supported in your country, there is an option available to integrate with a Stripe Standard account. More information is available here.
Additional POS systems are not supported at this time.