Advanced – Security Testing
API Key – ISTQB Definition
Last Updated: July 12, 2026 · SoftwareTestPilot QA Team
Official ISTQB Definition
A shared secret string used by a client to identify itself to an API.
In simple words
A long secret string used to identify the caller of an API.
Exam tip
API keys prove identity, not user identity; never commit them to source control.
Related terms
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