---
title: "Plaid Updated OAuth error responses: 2026-10-13 | Harbyn"
description: "Plaid Updated OAuth error responses, announced Oct 13, 2026."
canonical: "https://harbyn.com/changes/plaid/2026-10-13-updated-oauth-error-responses"
last-updated: 2026-10-14
---

# Plaid Updated OAuth error responses

Markdown version of <https://harbyn.com/changes/plaid/2026-10-13-updated-oauth-error-responses>.

Behavior change - Plaid. medium severity. In effect.

Error responses from /oauth/\* endpoints are aligned with the OAuth specification for requests using content-type: application/x-www-form-urlencoded, and with the Plaid API for requests using content-type: application/json.

## Facts

| Fact | Value |
| --- | --- |
| Vendor | [Plaid](https://harbyn.com/vendors/plaid.md) |
| Kind | Behavior change |
| Severity | medium |
| Status | In effect |
| Announced | Oct 13, 2026 |
| Added to Harbyn | Oct 14, 2026 |
| Lead time | No dated deadline |
| Review | Reviewed by a person, extracted by a model |

## Find it in your code

```sh
npx harbyn scan
```

This change names no identifier the scanner can match line by line, so the scan tells you whether your repository uses Plaid, from its packages and API hosts. Nothing leaves your machine.

## Sources

Where this event comes from: the page we read, when we read it, and the hash of that snapshot.

- <https://plaid.com/docs/changelog/> (changelog, fetched 2026-10-14 05:00 UTC, sha256 `ff1046333effb9d876c5899a6fa63d2151374ea9f7125d48ac63b9b3a1474b05`)

## Related changes

### More from Plaid

- [Transfer events add the adjustment event type](https://harbyn.com/changes/plaid/2026-10-13-transfer-event-type-supports-adjustments.md) (Behavior change, announced Oct 13, 2026)
- [Account subtypes will be subdivided](https://harbyn.com/changes/plaid/2026-09-11-account-subtypes-will-be-subdivided.md) (Breaking change, effective Oct 11, 2026)
- [Empty Consumer Report webhook lists are returned as empty arrays](https://harbyn.com/changes/plaid/2026-09-11-empty-consumer-report-webhook-lists-are-returned-as-empty-arrays.md) (Behavior change, announced Sep 11, 2026)
- [Chase consent expiration can break Items and expire TANs](https://harbyn.com/changes/plaid/2026-09-03-chase-consent-expiration-can-break-items-and-expire-tans.md) (Behavior change, announced Sep 3, 2026)

### Changes at other vendors

- [Amazon Selling Partner API: ORDER\_CHANGE notifications add PreFulfillmentStatusChange for Amazon Autos](https://harbyn.com/changes/amazon-sp-api/2026-10-14-sp-api-updates-new-listings-items-api-ivp-values-in-eu5-jp-and-ca-stores-oct-3.md) (effective Oct 28, 2026)
- [BigCommerce: 301 redirects will apply only to storefront channels](https://harbyn.com/changes/bigcommerce/2026-10-07-301-redirects-now-apply-to-storefront-channels-only.md) (effective Nov 10, 2026)
- [GitHub: Secret scanning audit log business field changes to enterprise slug](https://harbyn.com/changes/github/2026-10-20-updates-to-github-secret-scanning-7.md) (effective Nov 12, 2026)
- [Jira / Atlassian Cloud: New IP address ranges in use from January 1, 2027](https://harbyn.com/changes/atlassian-jira/2026-10-16-atlassian-cloud-adds-new-ip-address-ranges.md) (effective Jan 1, 2027)

[All upcoming deadlines](https://harbyn.com/deadlines.md)