Apple Pay still hasn’t officially launched, but a fresh leak reveals how the mobile payments service will work for both shoppers and merchants using it. The news comes from 9to5Mac, which has a pretty good track record when it comes to leaking Apple’s plans but doesn’t offer any information on when Apple Pay will actually launch beyond what we’ve already heard.

As a customer, setting up Apple Pay should be pretty easy. You can either do it through Passbook, in the phone’s Settings menu or when you initially set up your new smartphone. When it comes to adding individual credit and debit cards, you can simply sync Apple Pay to your iTunes account or scan new cards in with the iPhone’s camera. One nice extra touch: when your card expires, Apple will get the new expiration date straight from your bank and update your info automatically.

9to5Mac also reports that Apple Stores around the country are already prepping to launch the new service along with the in-house Caffe Macs restaurant at the company’s own Cupertino headquarters. Retail employees will each take an hour-long Apple Pay training course, where they will learn how to use the service and troubleshoot it when something goes wrong.

Apple has another big event set for later this week, and while the focus is likely to be on new iPads, computers and OS X Yosemite, we’re guessing the company will devote some time to Apple Pay as well. Recent leaks suggest Walgreens could launch the new service as soon as Saturday, October 18. Hopefully Apple will announce its official roll-out schedule at Thursday’s event.