My younger son doesn't have data tariff on his phone. Can't use lightning in a local grocery store.

Since they use my (thus custodial) lnbits instance anyway, they also have a mint available.

my son mints echash at home and spend it at the store without internet access.

how that's not a use case?

(there is an alternative with LNURLw but they don't have a device to scan the QR)

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that was stupid of me, they scan his casu qr. so lnurlw will work too.