I had an unbelievable email letting me know that not only had my account been suspended, but that it was going to be cancelled if they couldn't get the CC payment to go through. That's the same card that works perfectly well with every other company I have an AP with and which has worked perfectly well with Lightbox except for this one payment.
In this situation I'd expect notification that the payment hadn't gone through and that they would retry and if I was aware of a problem please get in touch. But this appears to be beyond Lightbox - just suspend and threaten cancel. I'll finish now before my language deteriorates.