I went out of my way to stop at a Mcdonalds for a test, but I couldn't get it to work. So I read the 'how to' in the app and watched a couple of youtube videos, then tried again at the Jack-in-the-Box across the street. It didn't work at first, so I removed the protective case (not sure if that or being more patient and holding it there longer helped).
I got a 'sent' notification this time, but the cashier didn't see it on her end. After a few moments I tried again and it went through. I was happy to see that I wasn't in fact charged twice, but now I need to go running for an hour to work off the McDouble and curly fries.
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