The source code for the SagePay Integration Kit for .Net
The original code for this repository was originally provided by SagePay. I asked them for the code as I discovered a bug when the SagePay API returns a status of NOTAVAILABLE for the 3DSecure status flag. SagePay were fully aware of this, and told me:
Unfortunately this is a known issue with the .NET kit but there is no fix as of yet
They kindly provided the source to me and I have added in the (very simple!) fix. Additionally, various parts have been updated to use the more modern features of C# 6. As such, you will need Visual Studio 2015 (or higher) to view this project.
You are free to use this code as you wish but I take ZERO responsibility for anything that may go wrong!
If the nice people at SagePay ask me to take this down, I will do so without hesitation as it is still their original code. However, it would be very nice if they give me their blessing instead!