Co-branded credit card programs have been most successful when they match a very large merchant and a very large issuer. Imprint, a start-up with backing from Affirm, Kleiner Perkins, Stripe and Thrive Capital, sees an opportunity to bring to market program management for co-branded cards that delivers a more up-to-date consumer experience and expands the pool of partners to include smaller businesses. The company touts its user interface as superior to the in-app and online experiences cardholders have with legacy issuers. In addition to card account management, Imprint also provides a clo...