Hey @fj81 for you question "if we set the merchandised eVar with the add
to cart binding event, a product is bound when add to cart happens. Does
the transaction need to happen during the same visit in order to
attribute search term(s) to the specific product purchase ?" I believe
this depends on the expiry set on your eVar (the default is "visit", but
you change that in the Admin panel, maybe try Visitor?) Like anything...
test, test, test.... in your QA/Dev environment try different scenarios
...