I've posed this question before on ZC forums and didn't really receive a fully developed solution, just pointers. I contacted custom programmers who tried to get WAY more $ than the solution appeared to merit.
I've scoured the Internet to solve the following problem:
I want to prevent dual, multiple, simultaneous logins leading to membership fraud because I want to run a subscription based website showing pay per view educational videos. The proposed login/access scheme will grant access for paid customers who pass the mySQL username/password validation. One user can login but Zen Cart must prevent others who try to use the same login credentials from a different machine. Since I'm far from a code jockey I'm not in a good position to challenge, endorse, or implement any of these four suggestions below so I'm soliciting the expertise of my ZC gurus to lead the way for me and others who face the same challenge so we can keep it within the family. A great answer requires a pretty in depth understanding of how Zen Cart works under the hood. Please comment/critique these ideas and indicate which is best and give the nuts and bolts on implementation is Zen Cart 1.39h.
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