It works like this:
1. Create an event, i.e. a trip or event where shapred expenses have or will take place.
2. Add the users that shares the expenses in the app.
3. Add the currencies that you have used, and their relaitive values.
4. Everytime someone makes a shared payment, enter into the app who payed, and who benefits from the payment.
I.e if one person pays for dinner
5. mPayback will keep track of how much each of you owe or should be paid the whole time.
After the trip, it will allow you to distribute the results easily by sending an email to all of the other travelers.
It will also tag each expense with a GPS position, so you can see where you have been on a map.
(Opening the map will however require that you are attached to the internet, as it uses Google Maps.)
It does not include any advertising and it will not send any of your information without your knowledge.