i have a website statistics software running on my server which I can admin from the inside, the system backend. I can create websites to monitor, create accounts and give permissions to the account ("admin website xyz.com")
I want a frontend where visitors can create a client account and trigger the creation of an account inside the website statistics software. That contains contact data, which account in the statistics is managed by which client account, how many visits this website had (is tied to the billing).
The statistics software is piwik.