If I recall correctly PayPal discovered a flaw in their own system when naughty boys and girls would copy the BIN page LINK source code, then simply lower the price and try to process the order.
SO: I believe the Escrow[.]com keys generate random code for your / our protection on each domain link. From your account you've seen Bulk Import? Quoting: "Escrow[.]com created this service for creating "Buy It Now" buttons/links for a large number of Domains so You don't need to do it manually.
WE use javascript to simply read and display the domain from the URL in the browser bar, but then populate a window.setTimeout to push a user to any page we want that displays domain specific information.
For years we can and have easily done this to push to SEDO / AfterNic / DomainNameSales offer or BIN pages and so on but that's simple vs the Escrow format.The added advantage is that we can map as many domains as we want to one server account and push them all in different directions.
Sorry I ramble, but does this sound like what you're trying to do?