I have three pointers to my main domain, say, "hello_there.com".
Thus, I have 4 separate PIDs on CJ. Which one should I use for my eBay links? Would the "hello_there.com" one be OK? Or should I write a piece of Perl code that checks out the HTTP_REFERRER and changes the PID accordingly? All that I have to change is the number following "&track=" in the eBay address for an item.