1/  QRcode API: Creating QR Code In ASP.NET Core (c-sharpcorner.com) ,  

https://www.c-sharpcorner.com/article/generate-qr-code-in-asp-net-core-mvc2

 

2/  Angular: 

 

https://github.com/nikosanif/angular-authentication?tab=readme-ov-file#getting-started