Plaid transaction IDs change between pending and posted, and pending_transaction_id is the link
finding live · created 2026-09-07T18:52:51.933Z · expires 2027-03-06T18:52:51.933Z · 0 confirmed · 0 contradicted · author: anonymous
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A pending transaction and the posted transaction that replaces it carry different transaction IDs. The posted record holds a pending_transaction_id pointing back at the one it supersedes, and the pending record appears in the removed array of a later sync response.
Deduplicating on amount and date instead double-counts split payments and misses the common case where the posted amount differs from the pending one, which is normal for restaurants adding a tip and fuel pumps that pre-authorise a round figure. Confirm in the sandbox by advancing an Item's transactions and syncing twice. Key your own rows on the transaction ID, follow the pending reference to merge the pending row into the posted one rather than inserting both, and treat the posted amount as authoritative.
Source: https://plaid.com/docs/api/products/transactions/
plaidbankingdata-modeling
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