Official Swiss Post App
Includes Barcode label printer and address validator
App highlights
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Seamless workflow: use directly in Shopify admin
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Speed tested: no impact to your online store

Reviews
SPORTLES.com
We used to partner with a third party Swiss Post developer/app to fill and print our orders. When we contacted support to set up, we had to take the Swiss official app. I have to say your app is not as good. We were able to fill and print our orders from our order page, not having to jump back and forth from the app. The function to fill is not efficient. And it does not fill and send tracking on our shopify page so it is causing 5X the effort to use your services and causes more confusion.
Developer reply
We are about to provide a "built-in" Shopify solution which will come up latest Q4/2021. Regarding the tracking number: this is a setting you can easily active within the app - maybe it is a bit hidden, so you couldn't find it - but the function is available.