Screw it, here it is anyways. hate away. ** First hand experience using it **
Here we go...
Yes, you have to download the Walmart mobile app. You may not already have it installed, but millions do.
You then load a credit/debit card into the account. It does NOT have to be a checking account/ACH like MCX was intended.
I set a passcode but then it let me opt into using TouchID instead of the passcode which I chose.
When checking out, a QR code appeared part-way through the transaction on the pinpad screen. I opened my app, clicked "Walmart Pay" on the home screen, and then thumbprinted my way in. Two clicks and a thumb press. Not TOO crazy.
Scanned the QR code on the screen, then it linked my account to that transaction, and it was done. Really simple actually. The receipt showed up as a push notification almost immediately, and then was in my app. Pulling it up actually showed each individual item including thumbnails for each item (which I found impressive). I could also submit it with a single button press to the savings catcher program. They really did make it easy.
Few notes:
* The cashier had no idea what happened. Was confused, but seemed to trust me when I said "I just paid for it on here". I assume something on their screen showed them the balance was now $0.
* There was no printed receipt. This is different from Apple Pay in that you get all the same receipts typically since it's just a 'temporary' credit card, and the POS has no care that it was not a physical credit card in determining how to finish it off. This could pose an issue for locations who like to check receipts on the way out. It also confused the cashier as it was that awkward "so, we're done here?" without the receipt handoff.
All in all, pretty decent experience. Knowing that Walmart is not targeting the high-tech, Apple-product spending audience most of the time, opening it up to other methods that will work with basically any phone with a camera (so 99% of them), this is good for them, and honestly really well done for what it is.
And it took an unlock, 2 clicks, and a thumb-ID. Not too much more than Apple Pay.