I have a return URL set up and working. It will update my database with the sold item so that it is no longer available to sell (via php/mySQL). I need to validate that the visitor came from the paypal site and completed the payment. I have had instances where the page gets hit, but nothing is sold. Not sure if this is a spider crawling or someone hitting the page. The return url is sold.php?item=3 3 would be the item number that sold and the status of that item gets changed from available to sold. I was trying to use the referring URL, but that comes up as blank in php. So, now I have to manually update the status of any sold item. Any help would be appreciated.
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