To add another Macy's Credit Card or Macy's American Express® Card to your macys.com profile, you will need to know your account number, your name exactly as it appears on your card or statement, the security code on your card and the last four digits of your social security number.
" and log-in to your account with your email address and password.
Click the "Macy's Credit Card" link in the left hand navigation.
Select the "Add an Additional Card" link in the "Manage Credit Card" section.
Here you can submit your information to add an additional card. Please be sure to enter your name exactly as it appears on your card or statement.