Dear,
The app development was not too complicated but it took a bit longer as we had to find the hardware first and then use that hardware's SDK in our development. We used SecuGen scanner.
I can try to find and share the app which we developed and used but I am not sure if that can be reused unless one has the exact same model of SecuGen scanner.
May be a good solution will be to explore fingure scanning hardware around you and then develop a small integration app foe that.
Best Regards