Best way to develop billing software - advice me

Hi,
I am junior software developer. I am thinking to write a open source billing software witch can be used from ISPs and web hosting companies. I want to ask you what is the best approach for that goal.
1. I am thinking to use a server witch will sit between the router and servers with web content. That server will be installed with squid proxy and rules of iptables.
2. I will write a java program witch will listen on port for example 1001 and will listening for string from PHP program what will be hosted on the same or another server on the internet and will write those strings in squid's black list and will send to the system squid -k reconfigure to read squid it's settings. So when user's period for using the servers resources expire for non paying squid will block the access to that server and the web users won't be able to open the pages.
Is there more efficient way to realize my idea?
How the PHP program will send to the java program strings containing the banned IP's
If you had to design a billing software how you will do it?
Edit/Delete Message

rcbandit wrote:
Hi,
I am junior software developer. I am thinking to write a open source billing software witch can be used from ISPs and web hosting companies. I want to ask you what is the best approach for that goal.Don't. You lack the skills.
2. I will write a java program witch will listen on port for example 1001 and will listening for string from PHP program what will be hosted on the same or another server on the internet and will write those strings in squid's black list and will send to the system squid -k reconfigure to read squid it's settings. So when user's period for using the servers resources expire for non paying squid will block the access to that server and the web users won't be able to open the pages.Don't. Spying on your users is NOT good.
Is there more efficient way to realize my idea?Yes. Buy an existing system.
How the PHP program will send to the java program strings containing the banned IP's
Not. Your spyware will not get active cooperation from anyone.
If you had to design a billing software how you will do it?
I'd hire an expert.

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