Accel-KKR, a technology-focused private equity firm, completed the acquisition of Accertify, a provider of fraud prevention, chargeback management, account protection, and payment gateway solutions, from American Express, an American bank holding company. Financial terms were not disclosed. "As Accertify's partner, Accel-KKR is committed to bringing our firm's full resources, insights and capital to support Accertify's investment strategy and mission to help enterprise customers prevent fraud, reduce costs and ultimately increase revenue. Accertify has built an enviable market position thanks to its robust technology, deep client relationships, and talented team. We are eager to build upon this strong foundation and support Accertify in its next phase of growth and expansion," Park Durrett, Accel-KKR Managing Director.