When the credit union that issued your credit card closes, the National Credit Union Administration’s Asset Management and Assistance Center (AMAC) sends you a letter to notify you of the same. If you have an outstanding balance on your credit card account, you will need to send payments as usual to the AMAC address mentioned in the letter. The card, in all likelihood, will cease to function unless your credit union is merging with another. In this case, you might get to use your existing card until a given date, after which you may get to use an automatically issued replacement card.