Radius accounting attributes

Ok so say i have a radius server

Where different account can log in

I want to manage the data usage of each account to be uploaded to their website account and represented as a graph of the accounts data usage

Now i have set mangle rules to keep track of data per account

But then how do i export this information to be pulled and uploaded to a website so users can login and check their data usage, on a realtime graph?

Can anyone help
@normis
@chupaka