[…] The recent news that American Express cash-back cardholders can now spend their Reward Dollars on Amazon helps forge a bit more of the path towards ubiquity. As PYMNTS reported Monday (Nov. 20), a single Reward Dollar equals $1 on Amazon’s website or app. Cardholders can link their eligible American Express card to their Amazon account and then select Reward Dollars as the payment method at checkout, and the rewards dollars help defray, or cover, the cost of the item being bought on Amazon.  […]