Effective immediately, shoppers can earn American Express Membership Rewards points and Saks Rewards points every time they use the American Express Platinum or Centurion card at Saks Fifth Avenue and Saks.com.

Interested shoppers will have to enroll their cards and all spending is retroactive to Jan. 1. To enroll, call (888) 307-7736. The amount you spend in the current calendar year will determine the value of your Saks Fifth Avenue gift card. A spend of between $5,000 and $9,999 will earn a $200 gift card; increase to a spend of between $10,000 and $14,999 and earn a $400 gift card; those in the $15,000 to $19,999 bracket will earn a $600 gift card and those spending more than $20,000 will earn an $800 gift card.