If you raise an invoice in anything other than GBP in Sage One, the customer is still shown the Pay Now button on the PDF invoice, however when they click through to the invoice URL, the Pay Now button doesn't show. Stripe can support over 135 currencies, they do the fx conversion in the Business Bank Account base currency, which for me is GBP, so Sage One should be able to support this and reflect the actual GBP amount that was debited from the card.
This limitation is NUTS considering stripe support multuple currencies.
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Agree, especially confusing for clients when the pay now button is still present on the invoice but they are unable to pay via card.
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If you are still unable to support this then you should look at removing the Pay Now button for invoices that are not GBP to avoid confusion with the customer.
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