After you've confirmed your orders on Catch, you can bulk export the order details for processing in your warehouse.
Using the menu, navigate to My Orders > Orders to Process
You will find a download button on the top-right corner of the page, then click the "CSV Export" button (see image).
Clicking that button will let you download the order details.
Attached is an example template that provides the file headers and example data.
NOTE: the attached example shows completed orders, if you download this file and customer delivery details are missing it means you'll need to "Accept" those orders.