Report comes in that there is "no purchase confirmation screen" in the app.

Well, yes the hell there is, so I use the test credit card to make a purchase. Sure enough, it works fine on my testing account. Just to be sure, I try a couple other test accounts. Flawless.

"No, try it on *this* account"

I try again on their stupid account. Works fine.

"Well I just tried it in Chrome and it worked, it doesn't work in Firefox"

I was already testing in Firefox...

Wasting my time over a corrupted browser profile.. GTFO, why are you even a tester?