When I go out with my friends, I don't have to keep track of bills paid to add them manually to an expense manager. Thats the inspiration for this idea.
It basically integrates with the POS terminal to select the order, make payments and finally split it with your friends on the expense network.
We used Clover's POS Terminal, leveraging its Android and REST API's to build the application to run on their POS.
Challenges ....Working with Clover SDK and API's. Working with a team of mixed skill-set and finally coming up with ideas and hacking on it through the night.