generated: '2026-07-21'
method: derived
source: >-
  Derived from RingCaptcha SDK auth model and homepage compliance claims
  (ringcaptcha.com). GDPR compliance stated on the marketing site.
standards:
  - id: oauth2
    conforms: false
    evidence: API uses static app_key/api_key/secret_key credentials, not OAuth.
  - id: oidc
    conforms: false
  - id: rfc9457-problem-details
    conforms: false
    evidence: Errors use a custom {status, message, code} envelope, not application/problem+json.
  - id: e164-phone-normalization
    conforms: true
    evidence: normalize endpoint returns E.164-formatted numbers.
  - id: gdpr
    conforms: true
    evidence: RingCaptcha states GDPR compliance on ringcaptcha.com and its privacy policy.