# Plaid updates OAuth error responses for form and JSON requests

By Steven Van · 2026-10-13

Sandbox transactions now work on every Item with up to 730 days of history, while Link adds Haitian Creole and UK returning-user support.

Error responses from [Plaid](<https://creatorstoolbox.com/tools/plaid>)’s /oauth/\* endpoints now follow the OAuth specification for requests using application/x-www-form-urlencoded, and the Plaid API format for requests using application/json. The [October 13 update](<https://plaid.com/docs/changelog#october-13-2026>) also expands Sandbox testing and adds changes to Link, consumer reports, identity checks and transfers.

## Sandbox transactions and Link

/sandbox/transactions/create now works on every Sandbox Item, rather than only those created with user\_transactions\_dynamic. It can create transactions up to **730 days** in the past, up from 14 days, and accepts an optional account\_id to associate a transaction with a specific account.

Link now supports Haitian Creole (ht), and the Link Returning User Experience is enabled for the UK.

## Consumer report workflows

Plaid Check Consumer Report adds /cra/report/create and /cra/report/get to consolidate API workflows. The older /check\_report/ endpoints remain supported. An optional cra\_report\_parameter object in /link/token/create configures Plaid Check products for a Link session using the same parameters and products entries as /cra/report/create.

The Account object also gains paired\_account\_id. For Items created through a hybrid flow using both Plaid Inc. and Plaid Check products, it identifies the corresponding account at the same financial institution on the paired Item.

## Identity checks and transfer adjustments

- /identity/match/list returns a paginated list of Link-based Identity Match checks and outcomes. Access requires contacting an account manager.

- Identity Verification responses now include kyc\_check.id\_number.ssa\_verification, containing the SSA match result and is\_deceased status.

- TransferEventType gains adjustment for adjustments caused by rare activity, such as a dishonor. The event\_amount field records the adjusted amount: positive amounts credit the ledger, and negative amounts debit it.

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Plaid

Connect your app to users' bank accounts — the API that powers fintech. Build financial products with easy, safe, and reliable data access.

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[Original source](<https://plaid.com/docs/changelog#october-13-2026>)

[Read Plaid updates OAuth error responses for form and JSON requests on Creators Toolbox](<https://creatorstoolbox.com/blog/plaid-updated-error-response-for-oauth-endpoints-to-be-aligned-with-oauth-spec>)

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Canonical source: https://creatorstoolbox.com/blog/plaid-updated-error-response-for-oauth-endpoints-to-be-aligned-with-oauth-spec