API Key Rotation

Overview

Understand the idea

Rotation limits exposure duration and supports routine hygiene, staff changes, policy updates, or incident response. A safe process creates a replacement, distributes it securely, updates consumers, verifies use, and disables the old key after controlled overlap.

Immediate replacement can cause outages when unknown services still use the old key, while long overlap preserves compromise risk. Shared keys, missing ownership, cached configuration, delayed deployments, and absent usage telemetry make completion difficult to prove.

Organizations should inventory key owners and consumers, automate secret delivery, support two active keys briefly, monitor both, and define rollback. Rotation schedules must reflect risk, but emergency revocation needs a faster path with communication, validation, and post-change evidence.

What actually happens

API key rotation replaces a credential with a new one and retires the old credential under a controlled process. It limits the useful life of an accidentally exposed secret and supports regular security hygiene. In payment services, rotation must avoid both exposure and unexpected downtime: invalidating a live key before every application instance has switched can interrupt invoice collection or payout operations.

A safe rotation procedure inventories all consumers of a key, creates a replacement with minimum privileges and distributes it through secret management rather than chat or source code. Where the provider permits overlapping active keys, deploy the new one, verify successful requests, watch authentication error rates, then revoke the old key. If overlap is unsupported, coordinate a maintenance window. Emergency rotation after compromise should also inspect activity logs, pending payouts and whitelisted destinations for suspicious changes.

Decisions and failure cases

Rotating a compromised key does not undo malicious payouts that already happened. Also rotate related webhook secrets if compromised independently, and verify each environment uses the correct credential. Never display raw secrets in logs or include them in support screenshots.

Related concepts

API Key, Merchant API Key, Payout API Key.

Further reading

NIST Digital Identity Guidelines.