Initiates the Open Finance Brasil account linking process (enrollment) that enables PIX payment initiation without user redirection to the account holder institution. This creates a secure, persistent connection between the payment initiator and the account holder through a comprehensive flow involving user authentication, risk signal collection, consent management, and FIDO2 credential binding. The process includes: 1) User identity verification with CPF/CNPJ, 2) Device risk signals collection for fraud prevention, 3) OAuth2 consent creation with the account holder, 4) FIDO2 biometric/PIN credential registration, 5) Account link authorization. Once established, this enrollment enables seamless PIX payments without repeated user authentication at the account holder.