The purchase price of referral fee qualifying Product will count toward the total sales during the calendar month in which such Product are sold. Only qualifying products that are sold by MD Healthline, shipped to a customer and for which MD Healthline has received full payment will qualify for a referral fee. The total of such sales in any given month will generate referral fees, based upon the applicable percentage rate referral fee, according to the following schedule: All herbal products pay a flat 15% referral fee per bottle.