Well again...if you have, um, "mutliple" AP accounts...you can't use the same credit card to fund all your AP payments without setting off triggers. But you can use the same credit card (or two or three...whichever credit cards you're trying to reach minimum spend on, or bonus thresholds) to load your prepaid cards, and then assign a different prepaid card to each AP account.
Admittedly, this tip becomes more useful the more AP accounts you have. Maybe I didn't make that clear enough above. And like I said, this tip may be of diminishing usefulness, since AP seems to have gotten much more stringent in denying the opening of new bogus...sorry...
redundant accounts.
