[PeteePie]

supposedly it is a "trail" that someone may follow through a web site from the page they start on to the page where they decide to buy. Business jargon is probably the more common term, as in the following: Forbes, Annoying Business Jargon

[HandyDandy]

Thank you. Link was fun, too.
I suppose “purchasing decision journey” could then relate to the hunter following the trail of the shopper.