...
You will also notice that the settings can allow for a syncing entity decision. The syncing entity gives the Merchant a choice to sync whatever corresponding object should be used as an Order in ShipHawk. In this example, the Source system has two possible syncing entities: “Order” or “Shipment”. These are the names of the sales order and fulfillment object in this particular source system.
...
If you do not want to build out both syncing options, we recommend using the fulfillment entity for your initial build. Be sure to sync with the shipment entity (Example: in Acumatica, the Shipment entity, in NetSuite, the Item Fulfillment entity).
Order and Order Line Item Mapping are critical when dealing with Source systems as many ERPs and order source systems provide a lot of flexibility for Merchants they support. You will want to create Order and Order Line Item level mapping so that fields in your Source system can be assigned to standard fields or order- / line-level reference fields in ShipHawk.
...