37signals products are fully PCI compliant

The Payment Card Industry (PCI) Data Security Standard is a comprehensive security standard that establishes common processes and precautions for handling, processing, storing and transmitting credit card data. All 37signals products are fully PCI compliant which means an extra layer of security on top of our already state-of-the-art security. What all that means: You can rest easy knowing all your credit cardholder information is secure from any possible security breaches.