PCI compliance is not required when using Optimizer or enabling seamless mode for other gateways. Since Optimizer makes the necessary calls to these gateways, all transactions take place within the Razorpay environment. Razorpay's PCI certificate covers the necessary compliance requirements in such scenarios. Watch Out! PCI compliance is mandatory if you use Server-to-Server (S2S) integration for Razorpay and Optimizer instead of Razorpay Standard or Custom Checkout.