Our payments processor, Stripe, supports accepting ACH payments—direct from bank accounts. The fee paid by galleries for ACH payments is a flat $10. See our current Stripe credit card processing fees.
Once ACH is enabled in your account, you will have the choice whether you want to allow for ACH payment on remote pay of each invoice.
If "ACH Only" is selected, then when the collector remote pays, their screen will look like this:
The collector will be prompted to log into their bank account to complete the transaction.