Can you describe a bit more your problem, please? Because I refunded myself 2 times today in EUR zone with Stripe.
I had an amount issue/discrepancy because of shipping cost/price, but this is normal I think. Did you have the same issue?
Have fun with Shopify,
Edit : if you have currency conversion enabled + VAT in the wrong default currency, this mess with prices in Shopify. You can get more info at https://help.shopify.com/en/manual/payments/currency-formatting