Index, based in San Francisco, is a leading retail software company that helps retailers transform their in-store payments and build their customer contact database. Index’s core payment solution, built upon a semi-integrated payment solution and hosted gateway, provides retailers with industry-leading security, flexibility and reliability – at a lower overall cost. Its unique point-of-sale (POS) integration enables retailers to build an account for every shopper, capture customer contact data, drive opt-in to deliver personalized marketing, and optimize every campaign.