You can try adding one of their link codes (pointing to a site you don't promote so it registers as 0 clicks in your stats) to a basic html page, upload it somewhere, and have a few people with different IPs click it and see if it registers in your stats after an hour. It helps if they haven't searched for porn recently and have cleared their cookies and cache before clicking your link.
I've tested link codes before using multiple IP addresses (dynamic IP -- a dial-up connection's only plus) and browsers cleared of private data to find out they didn't seem to track. It's disheartening.
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