The credit card company's Passbook functionality will include notifications for new account transactions, along with the ability to view your current balance and redeem membershiprewardspoints.
Whether you have WorldPoints, Citi Thank You points, or American Express Membershiprewardspoints, retail gift cards usually offer the most bang for your points.
American Express is now allowing card members to apply membershiprewardspoints to their smartphone-enabled retail gift cards, then use them to instantly pay for purchases with their mobile device at select stores.