I would like to integrate Gravity Forms with aweber.
This is for an opt-in form. I use many sources of advertising and I want each link that sends a visitor to the form page to have a tracking code where I can then find out where my subscriber comes from
If someone clicks on one of my facebook ads, I would like to use a link like this...
Where source is a php variable and facebook would be the value of that variable
aweber has a hidden field called meta_adtracking for this purpose.
How can I setup a gravity form that will autopopulate the hidden field with the appropiate source?