You can't pay with a service like Mint with 2 cards at the time of purchase but even though your using two cards to pay for something like paypal credit bill [and it probably showing as two payments], you could complete a transaction with 2 cards on the final payment end. At least Mint does the math so I know if I take funds from x and y to pay z that I'm not over paying. Paying like that to me feels like it reduces transfer times and as long as I ear mark the funds in each account and the payment goes through everybody's happy.
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