Could anyone suggest the best payment extension to use with AbanteCart cart 1.2.10? more specifically something that works more like square does, as in you hook your own bank account directly to it and not through multiple companies.

Right now when i accept payments it goes through 3 different companies, 2 of which are charging me large fees about 25% of everything I process.

I run another website that's not on AbanteCart cart and the fees are much smaller with all the same ability to process credit cards.