generated: '2026-07-23'
method: searched
source: openapi/*-openapi.yaml
docs: https://api.ybs.co.uk/open-banking/v1.0/.well-known/ybs/openid-configuration
note: >-
  FAPI-grade OBIE security profile, confirmed against the live OpenID Provider
  discovery documents (well-known/*-openid-configuration.json). Beyond the two
  OpenAPI oauth2 schemes, the real deployment layers mutual-TLS transport
  authentication (certificate-bound access tokens), private_key_jwt client
  authentication, PS256-signed request objects and detached JWS response
  signatures (x-jws-signature), and PSD2 strong customer authentication for the
  PSU-present authorization-code flow.
summary:
  types: [oauth2, mutualTLS]
  oauth2_flows: [authorizationCode, clientCredentials]
  token_endpoint_auth_methods: [client_secret_basic, private_key_jwt]
  request_object_signing_alg: [PS256]
  id_token_signing_alg: [PS256]
  mtls_bound_tokens: true
  sca_required: true
  profile: FAPI 1.0 / OBIE Read-Write Security Profile
schemes:
- name: PSUOAuth2Security
  type: oauth2
  flow: authorizationCode
  authorizationUrl: https://authorisation.ybs.co.uk/public/authentication/pre_login.do
  tokenUrl: https://ob-ybs.api.ybs.co.uk/identity/open-banking/v3.1/token
  scopes: [openid, accounts, payments, fundsconfirmations]
  description: PSU-present SCA flow; response_types code / code id_token.
  sources:
  - openapi/yorkshire-building-society-account-information-api-openapi.yaml
  - openapi/yorkshire-building-society-confirmation-of-funds-api-openapi.yaml
  - openapi/yorkshire-building-society-payment-initiation-api-openapi.yaml
- name: TPPOAuth2Security
  type: oauth2
  flow: clientCredentials
  tokenUrl: https://ob-ybs.api.ybs.co.uk/identity/open-banking/v3.1/token
  scopes: [accounts, payments, fundsconfirmations]
  description: TPP client-credentials flow for consent setup and non-PSU resources.
  sources:
  - openapi/yorkshire-building-society-account-information-api-openapi.yaml
  - openapi/yorkshire-building-society-confirmation-of-funds-api-openapi.yaml
  - openapi/yorkshire-building-society-event-subscriptions-api-openapi.yaml
  - openapi/yorkshire-building-society-payment-initiation-api-openapi.yaml
- name: MutualTLS
  type: mutualTLS
  description: >-
    OB/eIDAS transport certificate required on every TLS connection; access
    tokens are certificate-bound (RFC 8705). Not expressible as an OpenAPI 3.0.1
    securityScheme but mandated by the OBIE profile.
  sources: [well-known/yorkshire-building-society-ybs-openid-configuration.json]
signing:
  request_object_signing_alg: PS256
  detached_jws_header: x-jws-signature
  jwks_uri: https://keystore.openbanking.org.uk/0015800001041RIAAY/UXIIubFcTJTeZJHCsEpt0L.jwks
fapi_headers:
- x-fapi-interaction-id
- x-fapi-auth-date
- x-fapi-customer-ip-address
- x-customer-user-agent