How to get webhook to fire for all records not just the first one to change

Michael, I guess that is perhaps where I'm goofing up (Forgive me I'm new to this.)1. If I don't put the Key in there, how does the webhook know which record in the parent table to update? 
2. Shouldn't the webhook fire one time for each record in the source table, rather than 1 time for 1 record and not for the rest?
3. The "repeat" had made sense to me in the case it only fires once, but I wasn't sure how to implement that. I tried it but it did not work (probably because I did it wrong)
4. Is there written documentation somewhere that shows how to do this stuff? I have looked at the PDF API guide, but it talks NOTHIGN about %RepeatOn% and other syntax issues. Perhaps I should be modeling this knowledge on some general language rules outside Quickbase, but I don't know where to look. I can learn it if I can just find the knowledge resource.

Thanks!

I suspected that if I didn't the Key field in there it would ADD a record when I just want it to update existing?

In one of the webinars Kirk Trachy discusses webhooks around the 50 minute mark.
You can view it here.  https://quickbase.webex.com/quickbase/onstage/g.php?RCID=0f84c132c8ee5cedca1ce94338ae3a7a

Just click on playback and enter your email etc to view it.

I'd like to sit in on one of his webinars - where do i sign up to join the club?

http://www.quickbase.com/webinars
There are also recorded webinars.   Very useful :)