{
  "schema": "varexis-public-evidence-record/0.3",
  "generated_at_utc": "2026-10-06T23:36:13Z",
  "record_id": "VXI-EXT-RFC9700-02-v1",
  "record_kind": "external_reference",
  "title": "OAuth: Public-client PKCE requirement",
  "system": "OAuth 2.0 Security",
  "evidence_family": "identity_access",
  "index_status": "PUBLIC_SAFE_SOURCE_REVIEW",
  "evidence_state": "PRIMARY_DOCUMENTATION_REVIEW_ONLY",
  "canonical_question": "What does RFC 9700 require for public clients using authorization codes?",
  "near_questions": [
    "Must public OAuth clients using authorization codes use PKCE?",
    "Does advertised PKCE support prove it is enforced?",
    "Which grant type does the public-client requirement cover?",
    "Can an agent infer PKCE configuration from an SDK name?",
    "What evidence distinguishes support from active protection?",
    "How should a receipt scope a PKCE claim?",
    "Does PKCE alone establish safe token storage?",
    "Why identify whether a client is public or confidential?",
    "Can a successful login prove all OAuth requirements?",
    "What remains unknown without flow validation?",
    "Does an unused security feature protect an integration?",
    "What context is needed for a public-client OAuth review?"
  ],
  "supported_claims": [
    {
      "claim": "RFC 9700 requires PKCE for public clients using the authorization code grant. A claim of PKCE support still needs evidence that the deployed flow enforces it.",
      "reliance": "DOCUMENTED_CAPABILITY_ONLY"
    }
  ],
  "not_demonstrated_claims": [
    "correct PKCE enforcement",
    "complete OAuth security",
    "tested protection from a library feature list"
  ],
  "public_summary": "RFC 9700 requires PKCE for public clients using the authorization code grant. A claim of PKCE support still needs evidence that the deployed flow enforces it.",
  "related_record_ids": [
    "VXI-EXT-RFC9700-01-v1",
    "VXI-EXT-RFC9700-03-v1",
    "VXI-EXT-RFC9700-04-v1"
  ],
  "source_review": {
    "source_type": "official_external_documentation",
    "source_title": "RFC 9700: Authorization Code Grant",
    "source_url": "https://www.rfc-editor.org/rfc/rfc9700.html#section-2.1.1",
    "checked_on": "2026-10-07",
    "candidate_record_id": "VXI-EXT-RFC9700-02-v1",
    "candidate_record_sha256": "8ab541dcf294f63c522e8c8d19d88a42c82a8643b166042844c6586253db3875",
    "method": "Primary documentation reviewed for the published bounded statement.",
    "deployment_tested_by_varexis": false,
    "revalidation": "Recheck the primary source, version and deployment context before paid delivery."
  },
  "answer_policy": {
    "classification": "DOCUMENTED_WITH_DEPLOYMENT_BOUNDARY",
    "bounded_answer": "RFC 9700 requires PKCE for public clients using the authorization code grant. A claim of PKCE support still needs evidence that the deployed flow enforces it.",
    "required_buyer_context": "The client classification, grant type and non-sensitive evidence of the configured flow.",
    "missing_evidence": "A broader claim needs evidence matching the intended use. Payment does not upgrade the evidence state."
  },
  "private_boundary": "Raw logs, thresholds, private paths, source code, protected mechanisms and reconstruction-level details are excluded from public and paid delivery.",
  "paid_access_note": "The public answer and boundaries are free. Pay first, then email a concrete question for asynchronous manual review, receipt or scoped export. No fixed turnaround or automatic API access is promised.",
  "service_route": {
    "request_guide": "/varexis-index/request.html",
    "request_workflow": "/varexis-index/request-workflow.json",
    "service_id": "evidence_receipt",
    "service_routes_url": "/varexis-index/service-routes.json",
    "payment_required": true,
    "accepting_paid_requests": true,
    "operational_status": "PAID_ASYNC_MANUAL_FULFILMENT",
    "checkout_url": "https://buy.stripe.com/28EaEXaPe7bBdGLgXSdwc05"
  },
  "authority_boundary": "VAREXIS-INDEX informs evidence reliance. It does not provide advice, certification, deployment authority, security assurance, production approval, or guarantee.",
  "human_page": "/varexis-index/catalog.html#oauth-public-client-pkce",
  "machine_readable_record": "/varexis-index/records/oauth-public-client-pkce.json"
}