June 17, 2014 5:54am EDT
Isis offers $1 back on each purchase of $1 or more when you tap to pay with your American Express Serve Card in the Isis Wallet. (There's a monthly earnings limit of $50.) Some transactions, such as transit and parking purchases, are excluded. Deal ends December 31.
There's a less expensive way, and then there's the way that works for you. The two may not be the same.
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