oauth.token

Exchanges a temporary OAuth verifier code for a workspace token.

Facts

Method URL:	`https://slack.com/api/oauth.token`
Preferred HTTP method:	`POST`
Accepted content types:	`application/x-www-form-urlencoded`
Rate limiting:	Tier 4

Developer preview has ended

This feature was exclusive to our workspace apps developer preview. The preview has now ended, but fan-favorite features such as token rotation and the Conversations API will become available to classic Slack apps over the coming months.

This deprecated method allowed you to exchange a temporary OAuth verifier code for a "workspace token". Use oauth.access to retrieve workspace tokens instead.

This is used as part of the OAuth authentication flow used by workspace apps.

As discussed in RFC 6749 it is preferred to supply the Client ID and Client Secret using the HTTP Basic authentication scheme. If HTTP Basic authentication is used you do not need to supply the client_id and client_secret parameters as part of the request.

Keep your tokens secure. Do not share tokens with users or anyone else.

Arguments

Argument	Example	Required	Description
`client_id`	`4b39e9-752c4`	Required	Issued when you created your application.
`client_secret`	`33fea0113f5b1`	Required	Issued when you created your application.
`code`	`ccdaa72ad`	Required	The `code` param returned via the OAuth callback.
`redirect_uri`	`http://example.com`	Optional	This must match the originally submitted URI (if one was sent).
`single_channel`	`true`	Optional, default=false	Request the user to add your app only to a single channel.

Present arguments as parameters in application/x-www-form-urlencoded querystring or POST body. This method does not currently accept application/json.

Response

This method's response differs from those offered by the classic Slack app oauth.access significantly.

Success example using a workspace app produces a very different kind of response

{
    "ok": true,
    "access_token": "xoxa-access-token-string",
    "token_type": "app",
    "app_id": "A012345678",
    "app_user_id": "U0AB12ABC",
    "installer_user_id": "U061F7AUR",
    "authorizing_user_id": "U0HTT3Q0G",
    "team_name": "Subarachnoid Workspace",
    "team_id": "T061EG9Z9",
    "permissions": [
        {
            "scopes": [
                "channels:read",
                "chat:write:user"
            ],
            "resource_type": "channel",
            "resource_id": 0
        }
    ],
    "single_channel_id": "C061EG9T2"
}

Typical error response

{
    "ok": false,
    "error": "invalid_client_id"
}

This structure communicates a short story:

An access token has been awarded or refreshed on the workspace identified by T061EG9Z9 ("Subarachnoid Workspace") for your Slack app identified by the ID A012345678.
The user who originally installed the app is the same user currently performing the authorization flow, user U061F7AUR.
The user approved the app for the chat:write scope, but access was only granted to a single public channel resource, C061EG9T2.
The app is automatically awarded the ability to read, write, and peruse the history of its conversation with the installing user in its app_home.

`oauth.token` response field guide

access_token - Your new workspace token that begins with xoxa. It can be very long.
token_type - You'll see app here. Workspace tokens were once known as app tokens. Maybe someday this value will become workspace.
app_id - This is the unique ID for your whole Slack app.
app_user_id - This is the user ID of your app. It's a user! It's an app! It's a user! It's an app! The user ID is unique to the team installing it.
installer_user_id - This is the user ID of the user that originally installed this app.
authorizing_user_id - This user ID belongs to the user currently undergoing the authorization process.
team_name - This is what the team calls itself.
team_id - This is the unique ID for the team.
~~permissions~~ - This field is no longer available. Use apps.permissions.info to look up all of your app's permissions for this workspace instead.
scopes - the OAuth scopes awarded to your app in this particular installation attempt.
single_channel_id - if this app is approved for a single channel, that channel will be listed here. See single channel authorizations for more info.

Use apps.permissions.info to look up your app's permissions on the fly.

Scopes categorized by resource

Scopes are grouped by resource type:

app_home - your app's direct message conversation with the installer of this app
team - team-level permissions assigned to your app
channel - public channels
group - private channels
mpim - multi-member direct messages
im - direct messages
user - permissions to work with or as specific users

The Permissions API describes in more detail how resources and scopes work together to enforce what your app can do.

Single channel authorizations

To request access to only a single channel, add single_channel=true to the querystring you generate for the oauth/authorize step of the OAuth flow.

Users will be asked to approve your app's requested scopes just for a single channel they choose. When the approval process is complete, the response to oauth.token or oauth.access will contain a single_channel_id field noting the channel resource.

Repeating this process multiple times on the same workspace adds additional channel grants to your app, one by one.

Use this approach with the chat:write and channels:history scopes to effectively install a bot into a single channel.

Ask for only chat:write just to post notifications into a single channel, turning chat.postMessage into a replacement for incoming webhooks.

Errors

This table lists the expected errors that this method could return. However, other errors can be returned in the case where the service is down or other unexpected factors affect processing. Callers should always check the value of the ok params in the response.

Error	Description
`invalid_client_id`	Value passed for `client_id` was invalid.
`bad_client_secret`	Value passed for `client_secret` was invalid.
`invalid_code`	Value passed for `code` was invalid.
`bad_redirect_uri`	Value passed for `redirect_uri` did not match the `redirect_uri` in the original request.
`invalid_arg_name`	The method was passed an argument whose name falls outside the bounds of accepted or expected values. This includes very long names and names with non-alphanumeric characters other than `_`. If you get this error, it is typically an indication that you have made a very malformed API call.
`invalid_array_arg`	The method was passed a PHP-style array argument (e.g. with a name like `foo[7]`). These are never valid with the Slack API.
`invalid_charset`	The method was called via a `POST` request, but the `charset` specified in the `Content-Type` header was invalid. Valid charset names are: `utf-8` `iso-8859-1`.
`invalid_form_data`	The method was called via a `POST` request with `Content-Type` `application/x-www-form-urlencoded` or `multipart/form-data`, but the form data was either missing or syntactically invalid.
`invalid_post_type`	The method was called via a `POST` request, but the specified `Content-Type` was invalid. Valid types are: `application/x-www-form-urlencoded` `multipart/form-data` `text/plain`.
`missing_post_type`	The method was called via a `POST` request and included a data payload, but the request did not include a `Content-Type` header.
`team_added_to_org`	The workspace associated with your request is currently undergoing migration to an Enterprise Organization. Web API and other platform operations will be intermittently unavailable until the transition is complete.
`request_timeout`	The method was called via a `POST` request, but the `POST` data was either missing or truncated.
`fatal_error`	The server could not complete your operation(s) without encountering a catastrophic error. It's possible some aspect of the operation succeeded before the error was raised.

Warnings

This table lists the expected warnings that this method will return. However, other warnings can be returned in the case where the service is experiencing unexpected trouble.

Warning	Description
`missing_charset`	The method was called via a `POST` request, and recommended practice for the specified `Content-Type` is to include a `charset` parameter. However, no `charset` was present. Specifically, non-form-data content types (e.g. `text/plain`) are the ones for which `charset` is recommended.
`superfluous_charset`	The method was called via a `POST` request, and the specified `Content-Type` is not defined to understand the `charset` parameter. However, `charset` was in fact present. Specifically, form-data content types (e.g. `multipart/form-data`) are the ones for which `charset` is superfluous.