In App Purchases iOS help

Has anyone implemented an IAP for iOS? There is one or two older threads on implementing IAPs but code the code included is not very well documented. I only know C*+ and nothing of objC which is why i am struggling. Is it possible to implement the IAP if i follow Ray Wenderlich’s tutorial on IAPs and then create the calls for C*+ through a .mm file? i have been pondering this issue for a while now. I have taken a look at Soomla but i have had no success and a great deal of trouble following their documentation.

Any ideas or suggestions would be really appreciated.