OBIE Confirmation of Funds API (CBPII, shared standard)
The OBIE Read/Write Confirmation of Funds (CBPII) standard for confirming whether funds are available on a payment account, secured with FAPI OAuth2/OIDC, mutual-TLS, and PSD2 strong customer authentication. Captured here as the shared OBIE standard reference; Leeds Building Society does not operate payment accounts and does not publish this API. Unverified for this bank - no base URL was confirmed.