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There is a nice article that describes how this feature works on the NFC chip. The URL it produces uses LUD03 and LUD17 from the LNURL spec. This diagram (source) also nicely explains how it works. In this case, the 'User with a smartphone' would be the merchant's point-of-sale device, and the web application would be the LNURL-withdraw server.
There's a draft pull request in LNbits for this purpose, and an accompanying article that describes the process of initializing the card. So the tools are still in the process of being built for home use atm.
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