I · WHITE PAPER No. 13 of XXI ELITE EDITION FINANCIAL-GRADE API SECURITY FAPI-Compliant OAuth2 Architectures for Regulated Banking - A Doctrine for Open-Finance-Ready Institutions A Doctrine-Grade White Paper for Tier-1 Financial, Regulated, and Sovereign Institutions - Aligned to NIST AI RMF · ISO/IEC 42001 · EU AI…