oauth.v2.access

Exchanges a temporary OAuth verifier code for an access token.

Facts

Method URL:	`https://slack.com/api/oauth.v2.access`
Preferred HTTP method:	`POST`
Accepted content types:	`application/x-www-form-urlencoded`
Rate limiting:	Tier 4

This method allows you to exchange a temporary OAuth code for an API access token.

This is the third step of the V2 OAuth authentication flow. Check out our guide to new Slack apps for more information.

We strongly recommend supplying the Client ID and Client Secret using the HTTP Basic authentication scheme, as discussed in RFC 6749.

If at all possible, avoid sending client_id and client_secret as parameters in your request.

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

Arguments

codeRequired

The code param returned via the OAuth callback.

Exampleccdaa72ad

client_idOptional

Issued when you created your application.

Example4b39e9-752c4

client_secretOptional

Issued when you created your application.

Example33fea0113f5b1

redirect_uriOptional

This must match the originally submitted URI (if one was sent).

Examplehttp://example.com

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

A potential gotcha: while redirect_uri is optional, it is required if your app passed it as a parameter to oauth/authorization in the first step of the OAuth flow.

Response

Successful token request with scopes for both a bot user and a user token

{
    "ok": true,
    "access_token": "xoxb-17653672481-19874698323-pdFZKVeTuE8sk7oOcBrzbqgy",
    "token_type": "bot",
    "scope": "commands,incoming-webhook",
    "bot_user_id": "U0KRQLJ9H",
    "app_id": "A0KRD7HC3",
    "team": {
        "name": "Slack Softball Team",
        "id": "T9TK3CUKW"
    },
    "enterprise": {
        "name": "slack-sports",
        "id": "E12345678"
    },
    "authed_user": {
        "id": "U1234",
        "scope": "chat:write",
        "access_token": "xoxp-1234",
        "token_type": "user"
    }
}

Successful Sign in with Slack response

{
    "ok": true,
    "app_id": "A0118NQPZZC",
    "authed_user": {
        "id": "U065VRX1T0",
        "scope": "identity.basic,identity.email,identity.avatar,identity.team",
        "access_token": "xoxp-yoda-yoda-yoda",
        "token_type": "user"
    },
    "team": {
        "id": "T024BE7LD"
    },
    "enterprise": null,
    "is_enterprise_install": false
}

Typical error response

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

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_grant_type`	Value passed for `grant_type` was invalid.
`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.
`oauth_authorization_url_mismatch`	The OAuth flow was initiated on an incorrect version of the authorization url. The flow must be initiated via /oauth/v2/authorize .
`preview_feature_not_available`	Returned when the API method is not yet available on the team in context.
`cannot_install_an_org_installed_app`	Returned when the the org-installed app cannot be installed on a workspace.
`no_scopes`	Missing `scope` in the request.
`invalid_arguments`	The method was either called with invalid arguments or some detail about the arguments passed are invalid, which is more likely when using complex arguments like blocks or attachments.
`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 an array as an argument. Please only input valid strings.
`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/json` `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.
`ratelimited`	The request has been ratelimited. Refer to the `Retry-After` header for when to retry the request.
`accesslimited`	Access to this method is limited on the current network
`request_timeout`	The method was called via a `POST` request, but the `POST` data was either missing or truncated.
`service_unavailable`	The service is temporarily unavailable
`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.
`internal_error`	The server could not complete your operation(s) without encountering an error, likely due to a transient issue on our end. 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.

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