Method to electronically collect certified funds?

[Owen Hehmeyer]

My tenants have bounced paper checks and also bounced electronic payments done as ACH transfers via a popular online rental management software. The 3 to 4 day delay on a paper check or ACH transfer is hard for them to budget for. My lease appropriately says that after a default rent must be paid via money order or cashier's check, both of which are "certified" funds, meaning the financial institution takes the money from their account before issuing the order or check. What is the electronic equivalent of certified funds? I know a wire transfer is electronic and certified, but they cost $25 apiece, require going to the bank, etc.. Venmo and PayPal both credit my account instantly, but I don't think they are certified funds - my understanding is that they would claw back the money if the ACH transfer later did not clear. And they allow partial payments (ugh!). So, is there such a thing as low or no fee, certified, instant, electronic funds?