That being so, if I'm honest I'm not really sure where the prior commenter's objection originates. Maybe they know about some directly accessible clearinghouse that I don't? I'd be surprised for several reasons to learn such a thing exists, but I've been surprised plenty of times before.
Because America doesn’t have the equivalent of a “receive only” code, every service has to build that functionality themselves “on top of” ACH, and prevent direct access to ACH debit and credit functionality.
That being said, for $10/month any business can get direct access to ACH including debits and credits, and then whatever gateway you use is supposed to do some level of fraud detection against your transactions.
In the article author's defense, he did pretty much disclaim any detailed or experiential knowledge right up front. That said, while my own relevant experience is now many years past and was in any case mostly refracted through the payment card industry, I didn't spot any obvious howlers.
Is that possible in any country? I've never heard of a banking system where ordinary people directly submit a transaction to the national clearing house. They always tell their bank to send their funds, right?