[Yankeeman07]

Fake news. ACH processes both debits and credits. Checks are not required. This is an electronic transaction.

If you read the original post, they are using a Check Instrument (Check 21) to obtain fees from the merchant,
based upon my conversation with Hanna from Segway. If I understand their procedure correctly.

Hanna can correct me if I'm incorrect.

For brokers that are charging PSF's, they want funds asap. In those situations, they are using a Check 21 or Check 22 -