International receipts are short

clareasmith Registered Posts: 7 New contributor 🐸
In the UK we have USD account and US customer is paying USD into this account therefore no currency exchange. However customer receipt is always $20 short. Customer says that this is not due to any charges evident at her side and our bank has said that it is not caused by charges at our side. Could this be a case of an intermediary bank being used? See
How can I get around this problem? If I issue the customer with an additional invoice for the $20 underpayment and she pays this alongside her next invoice then I will still have $20 outstanding on my sales ledger?
Any advice or insight would be greatly appreciated.
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