(5) Any retailer entering into an agreement with a resident of
this state under which the resident, for a commission or other
consideration, directly or indirectly refers potential customers of
tangible personal property, whether by a link or an Internet Web site
or otherwise, to the retailer, if the cumulative gross receipts or
sales price from sales by the retailer to customers in this state who
are referred pursuant to these agreements is in excess of ten
thousand dollars ($10,000) during the preceding four calendar
quarterly periods. This paragraph shall not apply if the retailer can
demonstrate that the resident with whom the retailer has an
agreement did not engage in referrals in the state on behalf of the
retailer that would satisfy the requirements of the commerce clause
of the United States Constitution during the four quarterly periods
in question.