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I'd say .htaccess but thats not really feasible when talking about plug-ins.
Having a unique key generated each time the refferal page is loaded is something I have yet to try.
E.g.
Visitor 1 -> your site -> plug-in gateway [unique key generated AOS*ndaod82noand2] -> Sent to plug-in
I'm not quite sure how this would work server side, because kron jobs every few seconds would put a bit of a strain on the server.
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