accept on-chain payments with zero confirmation under X amount

[islandbitcoin]

X amount should be a setting that can be set on the POS profile.

[Nodirbek75]

• Execute Lightning payment first; if it fails, fall back to on-chain payment.

• Use a unified QR code: https://bitcoin-qr.org/

• Show the success screen immediately if the amount is under X, without waiting for a confirmation block.

• If the amount exceeds X, wait for one block confirmation before showing the success screen.

• Subscribe to the mempool WebSocket to track block confirmations for amounts over X.

• What is the API limit for Mempool Space?