It's 1 a.m. You've had a few too many at a crowded bar and walk out without paying the tab. Your credit card and driver's license sit behind the cash register, leaving your personal info widely accessible while you sleep off those vodka tonics. There's a new option that might lessen the pain. Not the hangover pain — for that, you'll need aspirin. But if you've ever left your credit card at a bar by mistake, or spent several minutes trying to flag down a harried bartender to close you out, there may be a new option. Watch LiveApril the Pregnant Giraffe 'Continues to Progress': Zoo An upgrade being rolled out this summer to MasterCard's mobile payments service will let people open,...
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