http://www.gravityhelp.com/forums/topic/right-parameter-names-to-pre-populate-the-names-fields
I have followed all the steps in this previous forum thread, and have it all working, this forum has been really helpful. But I have an extra field 'Company Name' which im trying to populate on another form and I'm wondering how do I find the field ID thing I need to do it (e.g. user_lastname). I tried user_company.
I appreciate the help!