Shopify Help has a page now for shipping manifests. There is a link on this page to download the app:
Thanks for the link. We are adding this right now and will update it. We do about 100 shipments a day with the pirate ship end of day report option and will attempt to test this out to see what errors we find. Please post updates as well so that we can all perhaps see if there are errors that are yet to be found by Shopify. This is a good start..
This is an accepted solution.
As mentioned in this thread already, there is an update on this feature now.
We’re happy to share that you can now generate a SCAN Form for USPS shipping labels purchased with Shopify Shipping using the free Shipping Manifests app. For those who are not aware, when you generate a SCAN Form for a batch of shipments, USPS scans one barcode on the form to accept all of those shipments instead of scanning each package individually. Learn more about how to create SCAN Forms on Shopify.
Thanks again all for your feedback
This feature is only available for USPS. I will let the product team in charge of this aware of your feedback for this for future updates. Thanks for the feedback!