It looks like Apple is starting to offer the option to pay with PayPal on its Apple Online Store. The feature was first discovered on the German Online Store, and seems to be limited there for now, but it’s probably indicative of a broader roll out to other countries at some point.
For a while now, users in the U.S. have been able to set up PayPal as a payment option for their Apple ID on the desktop, which allows for purchasing content on iTunes and the Mac App Store. Apple also allows education customers to use PayPal for purchases of iOS apps, but there service hasn’t yet extended to Apple’s Online Store.
Users in Germany will find an explanation on Apple’s help page for how to choose PayPal at checkout. Instead of setting up a PayPal account as a payment option for their Apple ID, they will be redirected to log in using their PayPal username and password when purchasing something.
Hopefully other countries will start seeing PayPal as an option for the Apple Online Store soon too.