Accel-KKR, a technology-focused private equity firm, agreed to acquire 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. "Since our inception, Accertify has focused on the success of our customers, constantly delivering value and helping them grow. I am so proud of our team's accomplishments. We are excited to write our next chapter with Accel-KKR. We have experienced tremendous growth and accomplished so much with American Express; our thanks to Amex for their support and leadership," Mark Michelon, Accertify President.