Plaid Fintech

This covers the core Plaid integration patterns you need for linking bank accounts and pulling financial data. It walks through Link token flows, the transactions sync API (which beats the old get endpoint), and proper webhook handling for real-time updates instead of naive polling. The anti-patterns call out common mistakes like storing access tokens in plain text and ignoring item errors when users change their passwords. The sharp edges table is unfortunately light on specifics, but the patterns themselves are solid for anyone building account aggregation, ACH payments, or identity verification features on top of Plaid's API.