transactionReceipt for in-app purchase is deprecated in iOS 7. What can I replace it with?
You can get the receipt as the contents of the mainBundle's appStoreReceiptURL. You can find references: developer.apple.com
This is untested code, but off the top of my head, I'd say something along the lines of:
[NSData dataWithContentsOfURL:[[NSBundle mainBundle] appStoreReceiptURL]]should get you the same result that transactionReceipt used to return.
In case anyone maybe also confused about this problem (Maybe You also read an a little outdated tutorial like me...)
Please checkout WWDC 2014 Session 305 Preventing Unauthorized Purchases with Receipts. It covers both iOS & OS X, clear and comprehensive.