Include extra field in API POST

Need to add an extra field being passed through API to POST a lead. Instructions from the partner are here: ====== "Hope all is well. We've recently added a new parameter to our leads, involving the inclusion of "Trusted Form." Instructions regarding this new parameter are in the "Integration Tools -> API Docs" section of your dashboard. There's no charge for this service, and you simply need to get the JS from the page below, implement it on your form's page, and pass the new value (the URL) it gives you directly to our API when you POST a lead: [login to view URL] We would like all of our affiliates to start including this parameter in your posts, as doing so will assist in matching your leads at a higher rate, since some of our buyers require it, and by passing it to us you'll be open to a larger pool of higher bids and payouts from our partners." ====== PM for site ...