Aggregators broker bank connections so you integrate once — with OAuth-based API access replacing credential screen-scraping as banks modernize; coverage and connection quality still vary by institution.
Scoped, revocable, user-visible consent and only the data fields your feature needs — the regulatory direction and the trust-building move are the same move.
Bank connections break (MFA changes, institution migrations) — reconnection UX, webhook-driven refresh handling, and graceful degraded states are the product quality bar, not edge cases.
Financial data inherits GLBA-class obligations and aggregator agreement terms — data retention, deletion, and downstream-use policies decided before launch, with counsel.
Skipping the discipline this article describes until an incident, audit, or stalled project forces it — every practice above is cheaper adopted early than retrofitted under pressure.
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