Welcome to the seller community, @dseeds! Nope—there are no additional fees on Square's end for processing international cards, though there is a chance that your customer may be charged for currency conversion by their card issuer. For more details, have a look here: Accept International Cards.
Hope this helps clear things up! Please let me know if you have any further questions. 🙂
️ Tom | he/him
Seller Community Manager | Square, Inc.
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