AiD API WordBook
On this page you can find the glosary for the

BPR - Business Profile Registration.

A BPR object represents data about a given user's enrollment to a certain business. This relation determines how a user can access that business' resources as well as their access access behaviors

PCR -Profile Cart Registration.

Yes, after a few months we finally found the answer. Sadly, Mike is on vacations right now so I'm afraid we are not able to provide the answer at this point.
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BPR - Business Profile Registration.
PCR -Profile Cart Registration.