{
  "@context": "https://schema.org",
  "@type": "CreativeWork",
  "name": "Step-Up Authentication",
  "dateModified": "2026-06-02",
  "spec": "RFC 9470 (OAuth 2.0 Step-up Authentication Challenge)",
  "trigger": "High-risk operations (payment > 10k THB, document signing, identity change)",
  "challengeHeader": "WWW-Authenticate: Bearer error=\"insufficient_user_authentication\", acr_values=\"urn:mace:incommon:iap:silver\"",
  "acrValues": [
    "phr",
    "phrh",
    "urn:mace:incommon:iap:silver",
    "urn:mace:incommon:iap:bronze"
  ]
}