I\'m trying to call a Java method from C#, it\'s called like this from java:
EgamePay.pay(thisActivity, payAlias, new EgamePayListener() {
@Override
I ended up solving this problem myself, the other answers posted here while good unfortunately did not address the fact the problem I was facing was in Unity.
The way I solved it was by writing a custom listener class in Java with a 'GetResult' function that returned a string explaining what the outcome was (i.e. which function was called and with what result) and a get function for the result which C# called through AndroidJNI.
After making the purchase call it was a matter of calling the get function from C# until I had a result.