Hello there, @CSikora12.

Charging the credit card automatically when making a purchase is currently unavailable in QuickBooks. You'll have to manually apply the charge to the transaction.

To start, you'll have to set up Non-Inventory or Service item for the credit card charge. I'll show you how:

1. Click on the Gear icon located on the top right.
2. Select Products and Services under the All Lists column.
3. On the Products and Services list page, click ‘New’ in the upper right corner.
4. Choose Service or Non-Inventory.
5. Fill in the necessary information.
6. Click Save and close.

Then you can now add the charge to your customer's invoice. If you haven't sent the invoice yet, you may follow the steps below:

1. Go to the Sales menu and select the Customers tab.
2. Find and open the customer's invoice.
3. In the Product/Service drop-down list, choose the item fee you've created.
4. Select Save and Close.

See this article for detailed steps: Add product and service items to QuickBooks Online.

Also, it's a good idea to tell customers about the charge before you invoice them. You can include the default email message this in your sales forms, just click this article for more info: Customize invoices, estimates, and sales receipts in QuickBooks Online

I'm adding these resources that might help you with your future task in QuickBooks: 

• Change product and service item types in QuickBooks Online
• Set up and apply automatic late fees to invoices
• Set up and track your inventory in QuickBooks Online

If there's anything else you need help with QuickBooks, feel free to leave a comment. Thanks and have a nice day!