Hi Brian,
Thank you for the request and for sharing the relevant documentation.

The InventoryTransfer endpoints you've linked are currently marked as unstable by Shopify. We generally avoid building on unstable APIs, as they are subject to change and may introduce data integrity or performance issues that could affect the reliability of your Fivetran syncs.

We’d be glad to reconsider support once these endpoints are marked as stable or generally available by Shopify. This helps ensure a seamless experience on our platform.

Please let me know if you have any further questions in the meantime.

Best,
Sandeep