Implementing Receipt Validation in Swift 3

Question

I am developing an iOS app in Swift 3 and trying to implement receipt validation following this tutorial: http://savvyapps.com/blog/how-setup-test-auto-renewable-subscriptio

Answer 1

I struggled my head with the same problem. The issue is that this line:

let receiptString = receiptData?.base64EncodedString(options: NSData.Base64EncodingOptions(rawValue: 0))

Returns an OPTIONAL and

jsonData = try JSONSerialization.data(withJSONObject: dict, options: .prettyPrinted)

cannot handle optionals. So to fix it, simply substitute the first line of code with this:

let receiptString:String = receiptData?.base64EncodedString(options: NSData.Base64EncodingOptions.lineLength64Characters) as String!

And everything will work like charm!