The process of moving integrations from an old interface to a new one without breaking operational dependencies. In identity and certificate programmes, API migration must account for authentication changes, workflow sequencing, data mappings, and cutover testing, or automation can fail even when the new endpoint is available.
Expanded Definition
API migration is the controlled shift of machine-to-machine integrations from one interface contract to another, such as moving from a legacy REST endpoint to a versioned service, a new authentication scheme, or a different event-driven pattern. In NHI and IAM programmes, the term covers more than URL replacement: it includes credential changes, scope mapping, service account adjustments, callback validation, retry behaviour, and dependency sequencing so automation continues to function after cutover.
Definitions vary across vendors when API migration is bundled with broader application modernisation, but in security operations it should be treated as a governance event with explicit ownership and rollback criteria. That distinction matters because integrations often depend on secrets, certificates, and token lifetimes that outlive the code change itself. Guidance from the NIST Cybersecurity Framework 2.0 aligns well with this approach: identify assets, manage change, and verify service continuity before decommissioning the old path.
The most common misapplication is assuming an endpoint swap is complete when the new API responds successfully, which occurs when downstream authentication, schema, or rate-limit dependencies are not fully tested.
Examples and Use Cases
Implementing API migration rigorously often introduces temporary dual-run overhead, requiring organisations to weigh operational continuity against added testing, logging, and access-maintenance costs.
- A payment workflow is moved from a legacy partner API to a new version, while both endpoints run in parallel until token exchange, idempotency, and webhook delivery are verified.
- A CI/CD pipeline is updated to call a new secrets service API, requiring certificate renewal and service account re-scoping before the old integration is retired.
- A certificate management platform shifts to a new provisioning endpoint, and automation must be retested for renewal timing, error handling, and audit logging.
- A third-party SaaS integration changes its authentication flow from static api key to short-lived tokens, forcing a coordinated update to rotation and offboarding processes.
NHIMG’s Ultimate Guide to NHIs shows why this matters: 79% of organisations have experienced secrets leaks, and 71% of NHIs are not rotated within recommended time frames. Those conditions make migration windows especially sensitive, because old and new integrations can both remain live long enough to be abused if cutover discipline is weak. API migration therefore sits at the intersection of change management and NHI lifecycle control. The same lifecycle logic is reflected in NIST Cybersecurity Framework 2.0, which expects controlled transitions and verification before production exposure.
Why It Matters in NHI Security
API migration becomes a security issue when legacy interfaces are left active, poorly inventoried, or protected by credentials that were never scoped for the new design. That creates shadow dependencies, duplicate trust paths, and forgotten secrets that attackers can reuse long after the intended cutover. It also complicates incident response because defenders may not know which endpoint, token, or certificate is still being exercised by critical automation.
For NHI programmes, migration is often where governance failures become visible. NHIMG reports that only 20% of organisations have formal processes for offboarding and revoking API keys, which means many migrations leave old credentials valid after the business believes the change is complete. That is a direct exposure path for service accounts, bot traffic, and CI/CD jobs. A security team should treat migration as a dependency map exercise first and a code rollout second, with explicit rollback, revocation, and telemetry validation. Organisationally, the NIST Cybersecurity Framework 2.0 supports the operational discipline needed to keep this transition controlled.
Organisations typically encounter the risk only after a failed cutover, when automation breaks or a legacy credential is discovered in use, at which point API migration becomes operationally unavoidable to address.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
OWASP Non-Human Identity Top 10 address the attack and risk surface, while NIST CSF 2.0 and NIST SP 800-63 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Non-Human Identity Top 10 | NHI-02 | API migrations often expose secret sprawl, stale creds, and weak offboarding. |
| NIST CSF 2.0 | PR.DS-1 | Covers controlled data and service transition during system changes. |
| NIST SP 800-63 | Authentication assurance informs service-to-service credential changes during API migration. |
Inventory API credentials, rotate them during cutover, and revoke legacy access immediately after validation.
Related resources from NHI Mgmt Group
Deepen Your Knowledge
Reviewed and updated by the NHIMG editorial team on June 25, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org
