The write-up
Numo was originally conceived as a NFC enabled lightning/cashu payment terminal. However, recent developments brought CDK (Cashu Development Kit) to potentially support Ark payments through its bark-payment-processor. This projects modifies Numo so that it requests arkoor quotes alongside lightning quotes, if the underlying cashu Mint supports it. The ark address is embedded in the unified BIP321 qr code, so the merchant doesn't need to switch between payment methods: the reading wallet simply chooses by itself whether to pay with lightning, ark or ecash. NFC ark payments would also be enabled, although no Ark wallet support this.