Hello, I am interested in your project. I can get the application done with C#, and create an installable package to install on any windows machine that can run .net 4 and above. I have checked the application flowchart for reference, however, I need to clarify something; if the attendance devices have skds, then the budget for this app will increase because integrating multiple sdks will require time and much effort, compared to apis. I will like to have your response wo we can discuss in depth. Thank you