TSB OAuth Toolkit (OTK) Server
TSB's OpenID Connect / OAuth2 authorization server (Curity OAuth Toolkit, OTK Server APIs v4.3.1), backing the FAPI-secured OBIE Read/Write services. Exposes the authorize, token, token-revocation, userinfo, JWKS, session, and OIDC dynamic-client-registration endpoints. The OpenAPI 3.0.2 contract and the OpenID Provider discovery document are publicly served at apis.tsb.co.uk; token issuance and protected operations require client credentials and (for account/payment APIs) mutual-TLS with OBIE/eIDAS certificates.