This is just the right place to get the answers you're looking for, @loot.
To clarify, did you mean eCheck (electronic check)? ACH and eChecks are both types of electronic fund transfers. The key difference between ACH and eChecks lies in the initiating party. In an ACH relationship, the receiving party can initiate the payment. With an eCheck, the payment always initiates with the paying party.
However, if you're referring to the "Check" payment method you use on Receive Payment, Sales Receipt, or Recurring Transactions page, these are considered ACH payments if you initiate the payment by entering the customer's bank info.
You can check out these articles for more insights on how do ACH and eChecks differ:
Let me know should you have any further questions on how ACH and eChecks works. I'm always around to answer them for you. Have a great day!
