GB Bank Payment Initiation API (PIS)
UK Open Banking Read/Write Payment Initiation API (PISP) - the OBIE standard for initiating domestic, scheduled, standing-order, international and file payments with customer consent. FAPI-secured (OAuth2/OIDC, mTLS, PSD2 SCA). Represented here as the shared OBIE Read/Write Standard; UNVERIFIED for GB Bank - no GB Bank developer portal or base URL was confirmed (no fabricated host).