We are using shipstation in a "fulfillment" capacity where we collect orders from multiple sources and are routing outbound orders for fulfillment to our traditional WMS system. We then provide back shipment details once the shipment is completed.
We would like to suggest that support be added for managing inventory levels through the API. A simple use case would be provisioning an endpoint to accept POST/PATCH/PUT requests to update the "On Hand" inventory for a product and warehouse combination.
We are also a customer of "Ordoro". This platform has inventory management features available. An example of updating inventory in their API documentation can be found here > Ordoro API Documentation.
There are also wider use cases for managing inventory change between Ship Station and popular e-commerce channels like "Shopify" or "Amazon" that could also benefit from the use of inventory synchronization settings and changes in available inventory. Please let us know if this is something that could be added to the ShipStation roadmap in the future.