This month the Cloud SIG of the PCI Security Standards Council released supplemental guidelines covering cloud computing. We’re happy to see APIs included as a recognized attack surface. As this document makes clear, responsibility for compliance for cloud-hosted data and services is shared between the client and the provider. API providers moving to the cloud should pay close attention to this document: Section 6.5.5 covers Security of Interfaces and APIs, while Appendix D covers implementation considerations that include API-related topics. For cloud-hosted systems, an API gateway can simplify implementation, secure PII and PAN data in motion, provide compliance and ensure auditability in these areas.