Hello there, @cats20020.

Currently, the ability to automatically list the credit card fee to the customer's invoice is unavailable in QuickBooks Online (QBO).

We are aware of how this would be a bonus to your business transactions. Therefore, our engineers are working on improving our product's features to meet your needs. 

You can also directly send feedback to us about this feature.

Here's how:

1. Go to the Gear icon.

2. Under Profile, click Feedback.

3. Share your feedback, and then Next.

I'm also adding this article to help customize the invoices that you send to your customers: Customize sales forms.

Feel welcome to reach out to us again with any concerns and questions you may have.