Fix duplicate payment confirmation counting bug that prevented refunds

The update_payment_confirmations_only function was using min() across ALL transactions
to the same address instead of checking the specific transaction for duplicate payments.

This caused duplicate payments with old, confirmed transactions to show 0 confirmations
if there were newer unconfirmed transactions to the same address.

Fixed by:
- Checking if payment is STATUS_DOUBLEPAY_REFUND
- Looking up the specific transaction ID from tx_hashes
- Using confirmation count for that specific transaction only
- Falling back to min() for regular payments

This will allow stuck duplicate payment refunds to proceed once their specific
transaction has 10+ confirmations.

make_post_sell/lib/crypto_watcher.py

@@ -2245,7 +2245,38 @@ def update_payment_confirmations_only(client, crypto_payment, coin_type):
             )
             incoming = res.get("in", []) or []
 
-            # Calculate total confirmations from incoming transfers
+            # For duplicate payments, find confirmation count for specific transaction
+            if (
+                crypto_payment.status == CryptoPayment.STATUS_DOUBLEPAY_REFUND
+                and crypto_payment.tx_hashes
+            ):
+                try:
+                    stored_txids = json.loads(crypto_payment.tx_hashes)
+                    if stored_txids:
+                        target_txid = stored_txids[
+                            0
+                        ]  # Duplicate payments store single txid
+                        # Find the specific transaction
+                        for tx in incoming:
+                            tx_id = tx.get("txid") or tx.get("transaction_id")
+                            if tx_id == target_txid:
+                                old_confirmations = crypto_payment.current_confirmations
+                                crypto_payment.current_confirmations = tx.get(
+                                    "confirmations", 0
+                                )
+                                logger.debug(
+                                    f"Updated SPECIFIC transaction confirmations for duplicate payment {crypto_payment.id}: {old_confirmations} → {crypto_payment.current_confirmations} (TX: {target_txid[:16]}...)"
+                                )
+                                return
+                        logger.warning(
+                            f"Could not find specific transaction {target_txid[:16]}... for duplicate payment {crypto_payment.id}"
+                        )
+                except json.JSONDecodeError:
+                    logger.warning(
+                        f"Invalid tx_hashes JSON for payment {crypto_payment.id}"
+                    )
+
+            # Calculate total confirmations from incoming transfers (for non-duplicate payments)
             if incoming:
                 min_confirmations = min(tx.get("confirmations", 0) for tx in incoming)
                 old_confirmations = crypto_payment.current_confirmations