My name is Aaron, I'm a guru here at Shopify!
I'm afraid there isn't a way to pass along those charges directly - any fees from a gateway do go to the merchant, and can't be charged directly to the customers. That said, you always have the option to add a markup to your products to cover the costs you're incurring there. You could do this by raising the price of the product themselves, or adding an additional markup to your shipping rates - if you'd like to maintain transparency for your customers, you could rename those rates to say "Shipping and processing" or something similar!
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Aaron | Shopify Guru