Pay On Publication? Results

Thanks to those of you who gave advice on this issue. (http://fineartamerica.com/showmessages.php?messageid=2071706)
I proposed a 50/50 payment. At first they declined, then fired back a yes. And two days later put the full amount in my PayPal account! I sent them the image they wanted with Photo Credit details. So The image will be used in the October issue!