Completes a request for authorization of a Connected App to access a User's account. Call this endpoint using the query parameters from an OAuth Authorization request, after previously validating those parameters using the [Preflight Check](https://stytch.com/docs/api/connected-apps-oauth-authorize-start) API. Note that this endpoint takes in a few additional parameters the preflight check does not- `state`, `nonce`, and `code_challenge`. If the authorization was successful, the `redirect_uri` will contain a valid `authorization_code` embedded as a query parameter. If the authorization was unsuccessful, the `redirect_uri` will contain an OAuth2.1 `error_code`. In both cases, redirect the user to the location for the response to be consumed by the Connected App. Exactly one of the following must be provided to identify the user granting authorization: - `user_id` - `session_token` - `session_jwt` If a `session_token` or `session_jwt` is passed, the OAuth Authorization will be linked to the user's session for tracking purposes. One of these fields must be used if the Connected App intends to complete the [Exchange Access Token](https://stytch.com/docs/api/connected-app-access-token-exchange) flow.