Automatic Clearing House (ACH) is both a payment tool and a method that electronically debits your customer’s bank account.
Think of it as an electronic payment from one bank account to another.
A merchant initiates the transaction by submitting an ACH file containing all the bank routing and account numbers to be debited, along with the transaction amounts. These transactions can be processed over the web using the payment gateway from TransGlobal Payment Systems or via telephone.
While ACH payments are not guaranteed (they must clear like a check does and may bounce), they are a useful alternative to accepting credit cards for some merchants.