I need to charge the CC processing fee to my customers when they use a CC. How do automatically apple the CC processing fee to my clients' invoices?

Thanks for posting in the Community, @trevorl77. I can provide clarification on processing fees.

QuickBooks Online (QBO) is currently testing a new feature that allows businesses to include a convenience fee for paying online, of between 1-4%. Additionally, this feature is subject to jurisdictional and credit card company restrictions and availability. 

Here's how to see if this option is available and how to turn it on:

1. Click the Gear icon, and select Account and Settings.
2. Choose Sales on the left and click the Pencil icon next to Convenience Fees.
3. Turn the setting On and select a percentage.
4. Click Ok and Done.

For information on new features coming to the software, I recommend visiting the Official blog: What's New in QuickBooks?.

Should you have questions or need anything, please let me know. Have a great one. 

Why does my account not have this option? How can I add the "convenience fee" option?