Key takeaways: Modern commerce stacks expand attack surfaces across APIs, cloud systems, third parties, payments, and customer identities. 1 compliance mandates strict client-side monitoring to prevent modern web-skimming and Magecart attacks. Strong ecommerce cyber security requires layered controls across architecture, identity, data, transactions, infrastructure, and integrations. Continuous testing, threat monitoring, AI-aware controls, and recovery planning help enterprises build resilient commerce platforms. Modern commerce platforms are no longer a single application sitting behind a firewall.