I am in the process of turning my website into a commercial subscription service, and I was wondering if anyone could recommend a good piece of password protection software for the purpose?
I would like it to be able to
1. Be compatible with a credit-card processing system like WorldPay
2. Be able to block use of the same username / password if used by more than a specified amount of IP addresses
3. Be able to remind subscribers when they need to renew their membership and be able to process such renewals.