Small shop taking sats or XMR? Decide these 4 edge cases before your first order, not after:
1. Underpaid: Monero lets people send any amount. Mark the order "partial", show what's still owed, and don't ship until it's covered.
2. Paid twice (a double click, or a retry from a flaky wallet): key fulfilment on the invoice/payment id, so the second payment becomes a refund-or-credit question, not a second shipment.
3. Paid after expiry: Lightning invoices just fail when they expire, but an XMR subaddress keeps working forever. Keep watching expired subaddresses for a few days and handle late payments by hand.
4. Seen but unconfirmed (XMR): show "payment seen, confirming" and ship digital goods after ~10 confirmations (about 20 min).
Writing these into the checker up front is about 20 lines of code and saves you an awkward support DM later.
#monero #lightning #smallbusiness #asknostr