After yesterday’s huge Google Wallet news, American Express told TechCrunch this afternoon: 

“We want to make sure Google’s mobile wallet product meets the standards we set for our Cardmembers in terms of transparency and clarity about transaction detail,” AmEx social media VP Bradley Minor told me. “Right now, American Express does not have an agreement with Google for our cards to be used in the Google mobile wallet.”

Ouch.  American Express is a member of the competing ISIS standard, as are Discover and Mastercard and Verizon/T-Mobile/AT&T. They also have a digital payment system called ‘Serve’