Coffee giant Starbucks seems to be on track to incorporate Apple's Passbook app from the end of September. The news means that the company will integrate its existing Starbucks digital payment card into the new app for users to pay for coffee.

Passbook is Apple's mobile wallet feature that runs on iOS 6 and allows users to store and organize tickets, boarding passes, store cards, and coupons. Starbucks has been using similar technology for over a year, which allows its customers to store money on a Starbucks card that is loaded into a smartphone app available for both iPhone and Android phones. Starbucks' customers can pay for their coffee by scanning the barcode that appears on the user's smartphone display over an optical reader at Starbucks.

Apple unveiled the iOS 6 operating system in June this year when the Cupertino-based smartphone maker touted the Passbook app as one of the vital features. Apple pushed out its latest operating system on Sept. 19 to its iDevices, and the iPhone 5 comes pre-loaded with the iOS 6.

With iOS 6 rolled out, Apple will expose millions of its device owners to the Passbook app. If retailers do not support the app then the new feature will sit without usage. However, with the extensive use of iPhones, businesses will try to integrate Apple Passbook as a payment method.

Starbucks will be one of the first to use Passbook along with American Airlines. Time will tell how businesses adapt to the latest trend and start accepting payment via Apple's Passbook.