PCI DSS compliance refers to meeting the security standard defined by the Payment Card Industry Security Standards Council for organisations that store, process or transmit cardholder data. In a composable payment infrastructure such as Hellgate.io’s Guardian module, achieving PCI DSS compliance means securing credential vaults, controlling access, maintaining segmentation and monitoring infrastructure. For enterprise merchants, embedding PCI DSS compliance into modular payment architecture is critical for mitigating risk and enabling scalable global operations.