A system includes one or more processors configured to receive a unique customer identifier that is generated by a computer of a referring vendor. The unique customer identifier associates a customer with a product purchased by the customer and covered by a referral agreement. The one or more processors distribute promotional material of a referral receiving vendor to the customer associated with the unique customer identifier. The promotional material incorporates the unique customer identifier. The system includes a computer of the referral receiving vendor that receives one or both of the promotional material or the unique customer identifier from the customer at a point of sale with the referral receiving vendor. Upon validating the unique customer identifier, the computer of the referral receiving vendor is configured to discount a purchase price of one or more items according to a predetermined discount rate in the promotional material.
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