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That call returns an element "total" at the top level of the response object that will be the number of packages for that order number.https://www.shipstation.com/docs/api/shipments/list/#:~:text=%7D%0A%20%20%5D%2C-,%22total%22%3A%202%2C,-%22page%22%...

You select the store on the new order screen, top right.

From the view order screen, click on the shipment icon on the left then the + icon in the panel next to it.

Re:#3 you can create a second shipment based on the first. On the order screen you have to click the shipment icon on the left then click the + icon.

I did the same thing with our products, originally for the pick list. Our packing slip "Order Items By" option is set to "None" to keep the original order, but I just tested by switching it to "Warehouse Location" and printing a packing slip, and it ...