Plaid Fintech

This covers the essential Plaid integration patterns you'll actually need: Link token creation and exchange, transaction syncing with cursors instead of polling, and webhook handling for real-time updates. The code examples show the complete flow from frontend button to token storage, including smart details like encrypting access tokens at rest and handling the TRANSACTIONS_SYNC_MUTATION_DURING_PAGINATION error. Missing the Auth/ACH and identity verification patterns mentioned in the description, but what's here is solid for basic account linking and transaction aggregation. If you're building anything that connects bank accounts, this gives you the right architecture from the start.