AWeber Subscriber Confirmation to create Joomla website membership

I require a tool that can automate the process of creating a user record in a Joomla! website based on the content of an AWeber email sign-up confirmation email message. This could be a script embedded in the html page sent to the subscriber's web browser after they have clicked their confirmation email link. It could run as a chron job on a specific email address on a pop3 email account. There are likely ways to accomplish this task that I am unaware of, so I leave that part to you.