With a default installation of the QuickBooks SDK, you can find the ones the validator uses here:
Primary keys within QuickBooks are ListIDs and TxnIDs. You'll probably want to store the returned ListID and TxnID from the responses in your application. FullName is also a unique key within QuickBooks, but it can change, so it's usually not a good idea to use it as a primary key.
If you're using Keith's / Consolibyte Solutions PHP framework, you must change the requestID=”…” attribute before using this examples!
You need to embed the $requestID parameter passed to your handler function as requestID=“xyz”