This project contains two steps
1. Generate a simple website that generates a bar code. People fill a small form (4 or 6 fields) and the websites generates the bar code accordingly. The website should refresh constantly waiting for someone to scan the code. Once the code is scanned the website shall receive a confirming that it has been scanned. I believe it would be easier that it be a 1 dimensional bar code.
2. Create a simple app (for iphone, android or windows phone 8, whatever is cheaper). The app should be able to scan the code generated in the website. Also, the app should also be able to make a payment using a credit card to a predetermined user in a database.
This is a very simple project. Would suffice with a prototype-quality finished product. If projects goes on then developer would have the opportunity to join the firm. This project would compete at an MIT start-up competition.