Hi MarkJames,
Thanks for posting in the Community! Let me share with you the steps on how to create a service item for Shopify fee and add it on your customer invoice.
Once done, open or create an invoice and apply the Shopify fee. Here's how:
For more detailed information, feel free to check this article: Manually add service fees to invoices in QuickBooks Online.
Let me know if you have any other questions, I'll be around to help. Have a great day!
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