Provide more details about orders that are combined in the API. When an order has combined the data that you provide in the API is minimal. You provide no data if the order is combined at the marketplace.
If an order is combined in your application all you provide in the API is the old order Ids under advanced options. We use the API to sync orders into our ERP/CRM. When an order is combined in Shipstation the surviving order only has the other Order Ids. However, the combined order changes the order line items and the API response does not tell you what the old Order Line Items where. A change would be at least provide the old order ID and the Old order line items that were on that order so that line items can be moved.
Secondly, if an order is combined in eBay inside the marketplace all you do is mark the order canceled in Shipstation. the order wasn't canceled it was combined with another order just not in shipstation.
I also have the same issue when building some integration with ShipStation. We have a bunch of Shopify stores connected to ShipStation and we are interested getting data about combined orders via ShipStation API. However, the API currently only show ShipStation ID of the orders that are merged, not the original Shopify ID. As non-surviving orders will no longer be visible through the API, there is not consistent way to get the mapping between the Shopify ID and the ShipStation ID. We tried to use webhook to get information about an order as soon as it's imported into ShipStation but it's not consistent
We are in the final stages of building a system that will automatically weigh, dimension, select the correct service, ship, and invoice the order.
ShipStation's API is the backend for rates and shipping. It works VERY well, but multi-box shipments are problematic because to my knowledge ShipStation will not let you split an order using the API. This would be a GREAT feature!
'@Admin any update on this. We may have to change to something else because of this. The lack of information that is given when an order is combined is causing hours of extra work each month.