# Finish signing in through an identity provider

> Page: https://docs.plotwork.dev/api/get-auth-sso-callback. Index of every page: https://docs.plotwork.dev/llms.txt

Where the provider sends the browser back.

`GET /auth/sso/callback`

## TL;DR

| Question | Answer |
|---|---|
| What does it do? | Finish signing in through an identity provider. |
| What does it take? | `code`, `state`, `iss`, `error`, `error_description` in the query string. |
| What does it return? | Status 200 with no body. |
| What can go wrong? | `302` to the return address, or to the portal's sign-in page with `sso_error`; `429` too many requests; `503` the portal's address is not set on this server. Every failure uses the one error envelope. |

## What it does

Where the provider sends the browser back. The flow is spent once and needs the browser's flow cookie; the code is traded with the PKCE verifier; the ID token's signature, issuer, audience, times and nonce are checked; the address must be on a verified domain. Opens a new session and redirects, or redirects to the portal's sign-in page with `sso_error`.

## Query parameters

| Field | Type | Required | Description |
|---|---|---|---|
| `code` | `string` | no |  |
| `state` | `string` | no |  |
| `iss` | `string` | no |  |
| `error` | `string` | no |  |
| `error_description` | `string` | no |  |

## Responses

| Status | Meaning | Body |
|---|---|---|
| 302 | To the return address, or to the portal's sign-in page with `sso_error`. | none |
| 429 | Too many requests. | [`ErrorResponse`](https://docs.plotwork.dev/api/schemas.md#errorresponse) |
| 503 | The portal's address is not set on this server. | [`ErrorResponse`](https://docs.plotwork.dev/api/schemas.md#errorresponse) |

## See also

| Doc | Why |
|---|---|
| [API reference](https://docs.plotwork.dev/api/reference.md) | Every endpoint, and the error envelope |
| [Schemas](https://docs.plotwork.dev/api/schemas.md) | Every request and response type |
| [Tool reference](https://docs.plotwork.dev/mcp/tools.md) | The operations as callable tools |