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Very sleek, thanks for sharing! For NFC to work, what does the client need to run on his phone? Any writeup on how all this works?
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Not clear how the POS communicates the amount to pay with a static URL. The database behind merchant's account at Coinos awaits one payment at a time?
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All our Coinos users get a static LNURL like this: https://coinos.io/p/bob
If you visit that URL when there's an active invoice for "bob" created in the last 5 minutes, it will have the minSendable and maxSendable amounts set to the amount of the invoice, otherwise the sender gets to choose how much to pay.
The lnurl at the end there is the encoded version of the static LNURL from above. By passing it at the end of that /ln path we're telling Coinos that we want to pay it.
If you're logged into Coinos with auto-pay turned on for that recipient, it'll just get paid immediately
If you're logged into Coinos but without auto-pay, you'll see a confirmation screen and a "send" button
If you're not logged into Coinos at all, you'll see a QR code and a button to "open wallet" which should launch your Lightning wallet app of choice.
So users don't need to have anything special on their phone to tap the NFC tag. They just have to have NFC enable (which is always the case in iOS) and the link should open in their web browser.
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@remindme in 4 hours
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