Cha+Cha is the short name for Challenge+Charity.
This App is all about doing something good while challenging your friends. Instead of gambling for a bottle of beer, the looser will donate a small amount of money to a charity organization.
This app was developed in just 24 hours during BattleHack 2014, a hackathon sponsored by PayPal.
It utilizes the PayPal-API with delayed payments that are captured / voided later when the challenge has been finished.
HTML, Javascript, Compass, Django, Grunt