Add a credit card fee to an invoice

Adding a credit card fee to an invoice is currently not possible, @bhundley. 

QuickBooks Online (QBO) doesn't have the functionality to add one. However, you can create a service line item to add credit card fees and manually attach it to any invoice. I can walk you through the steps of creating one.

1. Go to + New. 
2. Select Add product/service in the OTHER section.
3. Click on New, then choose Service.
4. Create a name for it that will help you identify this is for a credit card fee. 
5. Add the necessary information. 
6. Once done, hit Save and close. 

You can add this service item when you charge your cutomer with a card fee.

On the other hand, you can check out this article: Standard Payment Fees & Rates. This contains a clearer view about how QBO charges fees. 

Please drop down any other concerns you have about adding fees to invoices. I'm always around to help you out. Have a great one!