Monument Bank Payment Initiation API
UK Open Banking Read/Write Payment Initiation (PIS) API per the OBIE Read/Write API Standard - domestic, scheduled, standing-order, international, and file payment initiation for authorised PISP third parties. FAPI-secured (OAuth2/OIDC, mTLS, PSD2 SCA). Represented against the shared OBIE standard; the harvested spec is the OBIE standard, not a Monument contract - UNVERIFIED for Monument.