Added fraud check classes for RetailDecisions support
Mass changes - using generics for transactions via Gateway class, refactored library to use JSON.NET instead of System.JSON (now deprecated).
Version bump to 2.1.1
Expanding comments for Purchase model
Added website to fraud check model
Include ‘Error’ as fraud check result.
Global for serialiser settings, update the way we fetch the library version, remove proxy config.
Change item_cost to cost (serialisation)
Update response object.
Testing subscription changes
Expanded fraud check integration for purchases.
Version bump to 2.1.3