One thing that we all know is lacking in BlackBerry World is the fact that it does not support any form of Promo Code or Coupon Code with in the application. As it stands now the developer has to issue you a credit for your purchase through PayPal. This will all change in BlackBerry 10.1. YES promo codes are coming people!
As you can see in the screen shots above and below it looks like it will work great! The Screen shots were found in BlackBerry World on the BlackBerry Dev Alpha C. At this time there is now word on the actual launch of Blackberry 10.1, but rest assure it is coming soon!