Visa Developer Community

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Shared.CreditCard, how did they build it?

I noticed that the Money 20 20 hackathon winners for the visa dev challenge won last year.

Visa Developer Challenge Winners – Share.CreditCard wins at Money20/20 Hackathon


How did they do it? The visa token service doesn't have a limited-use token, and doesn't have limitations on money access. How did they access the NFC? Does anyone know?

 

Thanks