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Explore the complex world of cashless payment systems at chaos events through this 53-minute conference talk from MRMCD2025. Discover the legal and technical challenges faced when implementing point-of-sale systems at hacker conferences, drawing from real experiences at May Contain Hackers (MCH2022) and Gulaschprogrammiernacht (GPN). Learn about the regulatory requirements including KassSichV and DSFinV-K compliance, technical infrastructure components such as cash register tablets, technical security equipment (TSE), receipt printers, and card terminals. Understand the practical problems encountered during event deployments and gain insights into why implementing a cash register system at chaos events might not always be the ideal solution. The presentation covers the complete journey from initial implementation decisions through operational challenges, providing valuable lessons for event organizers considering similar cashless payment solutions.
