This code is decompiled to C# using the paytm DLL from PayTM GIT HUB location https://github.com/Paytm-Payments/Paytm_Web_Sample_Kit_dotNet Feel free to use this nuget if you want to integrate with continuous build and deployment in your project
First, install NuGet. Then, install Paytm.Checksum from the package manager console:
PM> Install-Package Paytm.Checksum