Tappybara - Building a Custom NFC Payment System for Events

Explore the development of an innovative digital payment system created for a chaos event bar that bypasses traditional American payment networks. Learn how the team at Saarländisches Chaos-Event Mega-Knowledgecamp built their own payment platform using NFC technology, allowing attendees to pay with pre-loaded bar credit through ticket barcodes or digital wallet features on Google phones. Discover the technical implementation details of NFC protocols for both Google and Apple Wallet, understand the complex NDA requirements involved in such systems, and gain insights into how you can implement similar solutions yourself. The presentation covers the motivation behind avoiding cash handling and traditional payment acquirers, the architecture of their custom payment system, and the various "NFC crimes" committed to enable seamless digital transactions at their event bar.