Dependency-light HTTP-JSON transport core for Go — the shared base for hand-written API clients, with OTel instrumentation, request hooks, and typed errors.
Official Go SDK for REGHelp Key API — push tokens (APNS, FCM), Cloudflare Turnstile, reCAPTCHA Mobile, Google Play Integrity, iCloud Hide My Email, Gmail OAuth, VoIP push. Stdlib only, context-first, typed errors.