# Authentication

[← All Documentation](/help.md)



How Barvinca connects to your Autodesk account and customer ACC/BIM 360 account.

## 3-Legged OAuth (User Authentication)

When you sign in with your Autodesk account, Barvinca receives a token that acts on your behalf. This establishes your session and account context.

The current Marketplace launch uses the Autodesk sign-in flow plus Barvinca's authorized app-level access for Bulk User Manager.

Your session expires after 30 minutes of inactivity. You'll be redirected to sign in again if it expires.

## 2-Legged OAuth (App Authentication)

Bulk User Manager needs account-level access that goes beyond your personal session. Listing users and running admin operations use Barvinca's APS app after your Account Admin authorizes its Client ID as a Custom Integration.

For the practical first-run checklist, use the [Setup Guide](/setup.md).

To set this up:

-   Open [Profile](/profile) and copy the Barvinca APS Client ID: u1c753JAoD7qgeoHR158KcQIHhNMGpr5GaNYpBgw8iHBJdwA
-   In ACC/BIM 360 Account Admin, add a Custom Integration and paste that Client ID
-   Grant Account Administration permission for Bulk User Manager
-   Return to Profile and run the test when available

Do not create a customer APS app or provide a Client Secret for normal Marketplace setup. Barvinca keeps its app secret server-side.

## Required Scopes

-   **Bulk User Manager** — Account Administration permission through the ACC/BIM 360 Custom Integration.

## Troubleshooting

-   **403 Forbidden** — Barvinca's Client ID is not authorized in the target ACC/BIM 360 account, Account Administration permission is missing, or the signed-in user is not allowed to access that account.
-   **401 Unauthorized** — Your session expired. Sign in again.
-   **Credentials validation failed** — This only applies to an advanced support-only override. Normal Marketplace users should contact support instead of entering APS secrets.
-   **No data appears** — Make sure Barvinca's Client ID has been added to your ACC/BIM 360 account as a Custom Integration.

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Canonical HTML: https://barvinca.com/help/authentication