Secure Checkout Overview Payment pages are the highest-value target for attackers — a single XSS vulnerability can lead to Magecart-style card skimming attacks that steal thousands of card numbers. Securing checkout requires enforcing TLS everywhere, implementing strict Content Security Policies (CSP) to prevent script injection, using payment tokenization to minimize PCI scope, and removing non-essential third-party scripts from payment pages. The good news: Shopify and BigCommerce handle most of this infrastructure automatically. WooCommerce merchants need to configure hosting and install s…