If you just got a paypal payment for $100 and feel like blowing it at the bar then no problem.....unless!!!!!!!!!!!!!
you stop at the gas station and run the card at the pump.
I just happen to pump some gas with my paypal and they now are sending email when I make a transaction. So I logged in just to see how fast that all went in and saw a hold on funds for $85. The gas pump pre-authorized me for $85 and it's still on hold.
I'm not sure about this but if someone had just $100 and pumped some gas then went to the bar they might get a big surprise when they try to pay the $50 tab.

Maybe they catch this but I have no clue.
Anybody know about this for sure?