Hi Edwin, and welcome to Tiki Community!
Now I know why this topic sounded familiar to me... ;-)
Edwin, I don't use this field since then... could you please update the documentation here: Action Tracker Field and ask fro help on the irc chat ?
As far as I remember, the tricky part was identifying the adequate fields in your form to be sent to your external url with the right syntax, etc.
Sorry I can't invest time on this right now, more than this short help (urgent work to be done)
I hope you can manage with the help on irc, and your trial and error (that's how I managed years ago).
And if it doesn't work foryou as expected, then it might mean that the feature is buggy. So that you could add a bug report at
So, welcome on board on the Tiki world! ;-)