The supermarket api, from what I hear, is open source. Which means it would be completely free to use. Not sure on the other stores since Amazon is not under that api, considering they're having to jump through some hoops to get categories up and going with that. As for the cardreader, off-the-shelf cardreaders are actually not expensive at all. They're all around 8 to 12 bucks. The wireless one will be home-grown as tat will feature the fingerprint scanner and all, but for now it's very much your standard run-of-the-mill card reader. Believe it or not this stuff is everywhere. If you do have questions they're very much willing to answer them, and they're extremely transparent about what the future could hold. For example, they did say if it became necessary that there may be a small subscription cost. But for now it's free. As for prime not being in the marketplace, I guess they are working around that by potentially hooking the reader into various assistants, so with Alexa you could order something with your card reader.
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