Order Tracking is broken.
After purchasing the lens I got the info that for tracking I should use the Shop app (by shopify). It showed the purchase and a tracking info. But the info never updated. By chance I tried the tracking code at the GLS website and got the info that the order is waiting for me in a GLS shop for a week already. If I hadn't tried that, it would have been sent back. The lens itself was alright. But the shop is terrible.