IN APp Purchase

Implement In App Purchase The Easy Way, Ever.

http://xcodenoobies.blogspot.in/2012/04/implementing-inapp-purchase-in-xcode.html

http://adcdownload.apple.com//wwdc_2011/adc_on_itunes__wwdc11_sessions__pdf/510_inapp_purchase_for_ios_and_mac_os_x.pdf

http://docs.xamarin.com/guides/ios/application_fundamentals/in-app_purchasing/part_1_-_in-app_purchase_basics_and_configuration

http://stackoverflow.com/questions/6570163/invalid-product-id-in-inapp-purchase