1. Facebook messenger peer-to-peer payments. https://developers.facebook.com/docs/payments. Facebook messenger peer-to-peer payments. https://developers.facebook.com/docs/payments.
2. Design considerations for a financial management system for rural, semi-literate users
3. Google wallet. http://www.google.com/wallet/. Google wallet. http://www.google.com/wallet/.
4. The times they are a-changin'
5. Recognition of QR Code with mobile phones