Hi ! hope you doing great !
I have been implemented GST Invoicing (IRN Generation). I can show u the demo.
I am aware of the APIs. I hope, that you have the api account. I can implement all given requirement like Imvoice Generation, Verification with signing, QR, Taxpayer, GST Returns etc.
I have more than 10 years of experience in .NET, C# Programming, VB.NET, WinForms, WPF, XAML, ASP.NET, MVC, Entity Framework, Microsoft SQL Server, RESTful API, Web API, JSON, SOAP etc.
You can have a look on my profile page.
Thank You
With Regards
Maroof Khan