What is ACH?
A payment that comes straight out of a customer's bank account. Compared with a card, it cuts the cost of getting paid by two-thirds or more.
ACH stands for Automated Clearing House, the bank network that also moves paychecks and most bill payments. The money takes a few business days to arrive, so it suits invoices, rent and repeat billing better than a sale at the counter.
For example
A landscaping company bills a $2,000 monthly contract. Paid by credit card, the fee is a percentage of the full $2,000. Paid by ACH, that cost drops by two-thirds or more.