I am not so clear on this. What happens if there in another Target or Home Depot style breach? If hackers get bank account, what stops them from draining the whole account?
Nothing.
Why, did you think MCX would worry about that? Don't forget they passed the fraud risk onto their consumers when they agreed to use it, so why would they care?
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Presumably, if Walmart were to accept ApplePay, there's a fee for them to pay. They obviously don't want to. Walmart is rather well known for not paying for anything it doesn't want to pay for.
Your presumption is wholly incorrect. Apple pay and Google Wallet both are just enabling a credit card payment in a more secure way. Neither charge the retailer. Its not about Apple Pay or Google Wallet or even NFC, its about Walmart not wanting to pay the credit card companies their cut.
So, to avoid that they have come out with this bat **** crazy, kludgy, laughable system that consumers will find a pain to use.
BTW you said "how many Walmart customers can use Apple Pay". I could ask "How many Walmart customers would be happy when they didn't just get an unknown charge on their credit card, but their whole bank account (for those who have one) was cleaned out" ?