On a product's page, "Who can see / buy this product" already let you restrict a
product to clients holding a particular pass type, or carrying a particular tag.
There is now a third option: **is a course participant**. Pick any of your
courses or workshops and the product becomes available to the people enrolled in
it.

The rules still combine with "any of these" logic, so you can offer a storage
locker to your teacher-training participants *and* to anyone on your unlimited
membership by adding one rule for each.

A client counts as a participant only while they are actually enrolled — someone
who withdrew, transferred to another cohort, or is still on the waitlist does
not qualify. The same tightening applies to the pass rule: a pass only counts
while it is active and inside its dates, so an expired, paused or not-yet-started
membership no longer unlocks a restricted product.

As always, this is enforced when the client tries to buy, not just hidden in the
shop — so the restriction holds however they reach the product.