LAS VEGAS —The stark reality about mobile commerce is that forit to happen on smartphones it almost certainly will requireone-click buying, mainly because of the difficulty of inputtingdata on small devices.

That was the jumping-off point for a lively Money2020 panel onWednesday, moderated by Javelin Strategy + Research executive vice president MaryMonahan, who said, “The impediment to m-commerce is data entry.We need to make it really simple to authenticate the user and forthe user to buy. Then it will happen.”

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The analogy is to the one-click purchasing Amazon popularizedlong ago in e-commerce, and the panel's suggestion is that form-commerce to gain users, a similar, one click and buy tool will beneeded.

Is that insecure?

Bill Ready, CEO of payments company Braintree – acquired lastmonth by PayPal for $800 million in an all-cash deal – said that aproblem is that “many don't understand that it no longer has to bea trade-off between convenience and security. The broader paymentsindustry still thinks that if it easy to pay it has to be insecure,but that is not true.”

Another impediment: “People are trying to protect their piece ofthe payments pie and this slows everything,” said Rodger Desai, CEOof Payfone, a New York company focused on creating andauthenticating mobile identities. That is: turf wars amongm-commerce players have slowed a broader push for innovation.

One fact, according to Ready: “Although there is a lot ofconversation about it, I think it is highly unlikely that existingpayments players will go away. We are unlikely to get rid of theexisting payments networks. What we will see is innovation on topof those rails.”

As for the biggest hurdle thus far for m-commerce, Pali Bhat, aproduct manager at Google, said, “Besides questions aroundsecurity, the biggest challenge is gaining ubiquity. If I can use amobile wallet in just one place, it's not that useful. I want touse it everywhere. That, to me, is the biggest barrier today.”