How does Rerun work without a full merchant account?

When you sign up for a Rerun live account, you are signing up for both a Rerun account and a payment processing account with Forte, Rerun’s processing partner. While the account will allow you to process both credit card and bank transfer transactions, it does not carry with it a monthly fee, batch fee, or early termination penalties. Use your Rerun account to process as much or as little as you’d like, and cancel at any time.
www.rerunapp.com