Shipping
Inventory is where shipping is run. It shows every stocked item as QuickBooks sees it and as APSync sees it (reserved, waiting, shipped), lets you run shipping for one invoice or all of them, and shows the progress and the packing slip and ShipStation file as they are produced. Undo, Get Files and Send Email live there too.
Settings decide what ships and what waits: release complete kits, hold the whole order when anything is short, incomplete breakouts, shipping methods. Defaults are the conservative choice.
Scenarios is every real shipping situation from MOM's order history, with what MOM did beside what APSync does, and MOM's printouts side by side where we have them.
Tests (on the main page) describes any order and runs it, instantly or for real on the test pair.