API Order/Shipping Question

We are a 3PL and will be using the API to download orders into our system -
How can we filter the download request so we don’t grab Orders that have already been imported to our system?

Shipping -
What API call is used to mark the Order as Shipped? Could you point/provide C# code for this


There are date offsets, and status filters for GETting orders from the API. You will have to have your own mechanism for determining whether you have retrieved the order yet or not.

Order mark as shipped: https://devapiverson.docs.apiary.io/#reference/order/orderordernumbermarkasshipped/post