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Getting your API key

  1. Sign up at console.flowsbuilt.com
  2. Subscribe to the SDK you want (ChurnKit Free is automatic)
  3. Go to API Keys → Generate API Key
  4. Copy the key — it is shown once and never stored in plaintext

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Key formats

Test keys send data to an isolated namespace — they never affect production metrics or fire production webhooks.

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Using your key

Pass the key when constructing the SDK client:
Never expose your API key in client-side code, browser bundles, or public repositories. Use environment variables and server-side code only.

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Keeping keys secure

  • Store keys in environment variables (.env, Railway secrets, Vercel env vars, etc.)
  • Rotate keys immediately if leaked — revoke the old key from the Console
  • Use test keys (ck_test_) in CI/CD pipelines
  • Create separate keys per environment (staging, production)

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Revoking a key

Go to Console → API Keys, click the Revoke button next to the key. Revocation is immediate and permanent.