Define a controlled vocabulary for purposes, each traceably linked to minimal data elements and retention timelines. Bind scopes to those purposes, enforce geographic restrictions, and record legal basis where applicable. Restrict reuse beyond the declared value exchange, log user‑visible commitments, and surface visual summaries. Measurable constraints reduce ambiguity, accelerate approvals, and prove that necessity, proportionality, and fairness drive each disclosure decision.
Guide people through a predictable redirect from the partner to the bank, where strong customer authentication confirms identity and consent is granted with plain language just‑in‑time. Use PAR and JAR to protect request details, PKCE for public clients, and signed claims to anchor intent. Return purpose‑bound tokens only after confirmation, and issue a receipt capturing timestamp, scope, expiry, and clear revocation instructions.
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