Status code:
✅ 200 → OK, API key aktif
❌ 400 → Bad Request, format request salah
❌ 401 → Unauthorized, API key invalid / expired
❌ 403 → Forbidden, key diblokir / tidak punya akses
⚠ 429 → Too Many Requests, rate limit
❌ 500 → Internal Server Error
❌ 502 / 503 / 504 → Server error / unavailable

Info kuota bisa muncul dari header response: X-RateLimit-Limit, X-RateLimit-Remaining, X-RateLimit-Reset