Isis adds American Express cards — now you really can’t leave home without it

Soon you’ll be able to apply that famous American Express slogan (“Don’t Leave Home Without It”) to your smartphone. Isis, the mobile payments venture between AT&T, T-Mobile, and Verizon, announced Thursday that it’s adding support for AmEx cards.

The news …

American Express transforms Twitter hashtags into savings for cardholders

American Express is giving cardmembers one super compelling reason to tweet about promotional offers: instant savings at name brand U.S. merchants.

The company launched a “Tweet your way to savings” program today to encourage members to sync their AmEx cards …

American Express takes to the streets with Serve mobile payment system (video)

At a recent rock festival in San Francisco’s Golden Gate Park, I ran into some American Express representatives promoting Serve, its new mobile payments product.

See below for a video I made about the product and its rock-show promotion tent.…