I built Paybaq after a hiking trip with friends resulted in a big mess of shared expenses. It was a real pain to track down all the charges, then figure out the repayments.
Now we use Paybaq to log expenses on the go. We always know how much everyone owes, then settle up when we get home in a matter of minutes.
I hope you find Paybaq useful, and if you have any feedback or questions, feel free to email me. Thanks for visiting.