You can implement Omnichannel Inventory functionality via the headless Commerce API, Connect API, and invocable actions.
- API Access
The headless Commerce API is the main programmatic interface with Omnichannel Inventory. To use it, configure authentication via Account Manager or set it up as an external client app. - Configure Headless Commerce API Authentication via Account Manager
To authenticate with Account Manager, set up an API Client ID, then use it to obtain a token for making API calls. - Set Up the Headless Commerce API as a Connected App
Set up the Headless Commerce API as a connected app.