516838 Curl script that automatically completes form for two sies

I use a crm/autoresonder called infusionsoft the problem that i have is that i have people registering on eventbrite then they have to turn around and fill out same info on my website with the webform created by my crm... So i would like to see happen is when they fill out my webform that it automatically completes the eventbrite form with the same information. I aslo need the ability to change the web address of the eventbrite hostng page for the event because i believe eventbrite gives each event a new webaddresss so i need to be able to just plug the new site in to the script