API Versioning for Regulated Industries: When Breaking Changes Become Compliance Events

DORA Art. 30

Article requiring contractual API deprecation notice periods for ICT third-party service providers

API versioning strategy in regulated industries must account for consumer obligations that go beyond backward compatibility. Healthcare APIs serving FHIR R4 and R5 simultaneously â€” the coexistence problem created by the shift from R4-mandated CMS-0057-F APIs to R5 capability â€” require a versioning strategy that gives payers and providers sufficient migration time. Financial services API deprecation under DORA Article 30 requires contractual notice periods. The sunset policy you embed in your API governance determines whether an API deprecation is a routine engineering event or a compliance liability.

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