Direct answer
Answer
Use Authorization: Bearer YOUR_API_KEY from trusted server-side code. V2 POST requests also require Content-Type: application/json. GET /api/v2/gender additionally accepts a query key, but headers keep credentials out of browser URLs. Missing, malformed or unknown keys can use the shared IP trial; check meta.access.mode is api_key for an account integration. Known disabled, expired or restricted keys do not fall back to a trial.
Further reading
Related guidance
Continue with the primary GenderAPI resources used for this answer.