Security is the foundation of any payment system. Stripe Radar uses machine learning to detect and block fraud in real-time, leveraging data from millions of companies across the globe.

PayPal's fraud protection is similarly robust, benefiting from its massive consumer database and decades of experience in online payments. Both systems are PCI-compliant and offer tools to help you manage risk.

Choosing between them often comes down to how much control you want over your security settings. Stripe Radar offers more granular controls for developers, while PayPal's system is more 'plug-and-play'.