Currently, there isn't an option to automatically alert your customer that they're paying credit card fees for their invoices. It's a great idea to inform customers about the service fees when they receive the invoice. As an alternative, you may want to include a note on the email message you send along with invoices.
Also, I encourage submitting feedback directly to our product engineers. They may look into this suggestion and consider adding the option in the future update. To send feedback, you can go to the Gear icon and select Feedback. Then, enter your suggestion and click Submit.
You might want to learn more about including service fees manually on your customer's invoice. This article will guide you through the detailed steps: Add service fees manually to invoices.
Keep in touch if you need more information on processing credit card payments in QuickBooks. Of course, I am always here ready to help you whenever you reach out, @samshappylawns.