The Amex Platinum Card is a charge card. However, its Pay Over Time feature for U.S. cardholders acts like a credit card for eligible purchases. This feature lets you carry forward the unpaid balance on eligible transactions by paying a variable APR. The card’s Plan It feature lets you split large purchases into monthly payments, and this option comes with no interest.
It’s important to note, however, that American Express assigns a Pay Over Time limit to your card, which applies to the combined total of your Pay Over Time, other Plan (referring to the Plan It feature) and cash advance balances. In addition, American Express holds the right to approve or decline a charge even if your balance does not exceed this limit.
Paying off your balances in full every month is an option, as is the case with any other credit card.