How to Sync Bank Transactions with Open Banking APIs (2026 Guide)

Short summary

Production bank-transaction syncing requires consent lifecycle management, token refresh, deduplication, and rate limiting—the details most tutorials skip. Compares certified providers (Plaid, TrueLayer, Tink, GoCardless) and covers three major production incidents: consent cascades on batch onboarding, transaction ID shifts when pending→booked, and rate-limit headers in response metadata.

• •Production syncs demand consent flows, token expiry handling, deduplication of overlapping records, and API rate-limit respect—not just GET requests
• •PSD2 certification (eIDAS QWAC) costs €3k-15k/year and takes weeks; managed providers absorb this so solo developers avoid the overhead
• •Three failure modes: consent cascades when users onboard in batches, transaction IDs changing at settlement, and rate limits in headers not body

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