They also alleged that American Express engaged in practices to deceive its federally insured financial institution into allowing certain small business customers to acquire American Express credit cards without the required employer identification numbers (EINs). EINs are required by law if the card recipient is a business entity such as a corporation or partnership; the requirement does not apply to sole proprietors. The United States alleged that American Express employees used "dummy" EINs such as "123456788" in opening small business credit cards in 2015 and the first half of 2016. These cards were sold to replace an American Express co-branded credit card that was being discontinued during that time. American Express allegedly allowed these "dummy" EINs to remain on the credit card accounts for up to two years before remediating the problem.