Notwithstanding that a handheld card reader is a great idea for merchants on the move ...

"Transaction fees are roughly the same as for the old U.K. device. In U.S. terms, that means a 2.7 per cent fee for a card swipe, 3.5 per cent plus 15 cents for a manually keyed transaction or a scanned card, ..."

And that's about a full 1% higher than for transactions made directly via MasterCard/Visa ...

“Apple negotiated lower rates for Apple Pay’s NFC transactions with banks, but PayPal didn’t say whether it has agreed to give Apple Pay transactions the same deep discounts.”

In the normal course of events, Apple Pay operates only as an "interface" to the world's retail banks' existing credit card system, at no extra cost to a merchant's arrangement with its acquiring banker! Indeed the banks are, for some incomprehensible reason, paying Apple a fee for allowing Apple to use the banks’ system to sell more iPhones—crazy!

Conversely, eBay's clunky "PreyPal" is little more than a cost-adding intermediary “merchant of sorts” operating a credit card merchant account via their own acquiring banker ... http://bit.ly/1nSA1Zl

Paydiant is in no way comparable to PayPal's mobile card reader; the mobile card reader is useful; Paydiant is another useless "dog" that will, eventually, sink below the waves, along with "PreyPal" ....