Go to Admin backoffice, System > Integrations

Edit the Integration already created and used to send credentials.

On Basic Settings > API, set Resource Access → All (for everything)

or Custom (for individually choose permissions by resource)

For a Custom setup, we should have at least:
- Orders (Sales),

Products (Catalog)

stockStatus (Stores > Settings > Configuration > Inventory Section)

https://devdocs.magento.com/guides/v2.4/release-notes/open-source-2-4-4.html