This isn't how I use my phone -- I don't think "Gee, I want to buy something on RueLaLa, let me load up ruelala.com", I usually get an email or see a tweet from them and click through from a different app. Maybe my behavior could be changed to go to Passible first and use their browser, but it seems like a huge hurdle.
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looks attractive but don't understand how it works without a desktop/web interface?
Swaypay