A C# port of Google's Play Billing SDK sample. This port uses Mono for Anroid.

The most important part of this port is that IMarketBillingService conversion was made with the following steps:

1. The IMarketBillingService.aidl must be converted to a .java file. An IDE such as Eclipse can do this for you.

2. Convert the .java file to C#.

3. BillingServiceStub.AsInterface(...) can now be used instead of trying to directly cast IBinder to IMarketBillingService.

This port is a close port, so no further refactoring was applied to allow the similarities to be seen. Refactor as needed on your local copy.

One other thing to note, is that the BillingService inherits directly from Service, thus all logic will execute on the UI thread. Inherit from IntentService for to execute logic on a background worker thread.

In order to initiate requests, use an instance of BillingService directly, such as:

    billingService.RequestPurchase("net.myapp.item1");

When testing with a developer account, you can receive signed responses from the google play service. You'll need to place your public key within the Security.cs file as a temporary way to validate the signed data. Long-term, you'll want to find a better way to store your public key.

I wasn't able to receive signed responses until I signed the .APK file. Refer to: http://docs.xamarin.com/android/tutorials/Preparing_Package_for_Android_Marketplace

You will also want to read the following link, regarding testing: http://developer.android.com/guide/google/play/billing/billing_testing.html