Wait, is 3,200 calls a day even that much? That works out to a little over 2 calls a minute, which does not sound like a crazy spike for a busy shop account. The real test is not one customer at 3k, it is what happens when ten of them do it at the same time and your meter starts lagging behind. A quiet first run does not prove the system works, it just means nothing broke yet. What happens when a card gets declined on that bigger bill, does it retry or does it just sit there while the calls keep piling up?

The "out of boredom" part got me because that's how it always seems to go. You buy a cheap tool for one thing and then it ends up paying for itself on some job you never saw coming. Same thing happened to me with a $12 test light years ago, figured it was junk and now it lives in my pocket. It makes you wonder how many times we've swapped parts on a guess when a few bucks of gear could've told us the truth in ten seconds.