User Login to application developed on thingworx throught finger print scanner

Hi,

We have a client's requirement that a user's login should work when they do a finger print scan from a scanner.

I have some ideas and need some assistance on how to achieve it on thingworx.

• The Biometric finger print scanner uses an intermediate application to store the scanned fingerprint data in a database. 
• I am planning to install this third party application on Kepware's server (Because it runs on Windows OS) and store the data scanned data on thingworx's model database. And from there is will use the scanned data to do the login.

My question is,  

• Is there a better way to do than the way i have suggested above.
• And in the above method, how do i do a backend login from the application side. Because if we create a user in thingworx and enter username and password, it automatically does the authentication and login.
• Now how do I achieve this through a service.

Regards,

Sri1