Is it OK to add tracking IDs to Clickbank-links after they've been generated? I got a lot of old links, can I just add "?tid=something" to them and everything will work?
I'd recommend using the Clickbank hop link generator to have your links secured. Yes, you can still use the old links and simply add a tracking ID and the and of each hoplink. Al.
Yes you can put a id , there is no problem with that. Or else generate all the links once again with tracking id you desire.