Integrate self hosted ninja invoice on my personal web application

I want to integrate this invoice system on my personal web application to an extend that the ninja invoice does not require login authentication. When a user click the link on the web application to the invoice section it head straight to the ninja invoice dashboard without showing the login form.

I appreciate anyone’s input in advance.

Maybe using something like this?

@Hillel Coren. Thanks very much I’l integrate, were I come across difficulties I’l keep in touch with you. Your input is highly appreciated.