Having implemented PayPal's Website Payments Standard, I'd like to link to the details view of a transaction from my site's back end - just a simple direct web URL to the PayPal side.

I don't know why this is tricky but when I try to get it from being logged in to the PayPal system it seems very obfuscated, in this form:

history.paypal.com/uk/cgi-bin/webscr?cmd=_history-details&info=[looks like some kind of GUID]&ptype=4&history_cache=[huge encoded string]

I'm guessing it's by design but it's not very helpful if you want a quick way to jump to a transaction's details. I've tried the https://www.paypal.com/vst/id=1234 form (also with co.uk as I am UK-based) recommended on a few sites I saw in my search, but I am told that:

The transaction ID in your link is invalid.

This happens even when copying the transaction ID directly from PayPal's back-end order listing.

Is there a reliable way to directly link to an order / transaction details page in PayPal?