How much (percentage or flat rate) does QB self employed card for a customer to pay and invoice by credit card?

Welcome to the Community space, @teacheryee.

Let me provide details regarding the percentage or flat rate fees applied by QuickBooks Self-Employed when a customer pays an invoice using a credit card.

As of the latest update, QuickBooks Self-Employed generally charges the following rates for invoicing and quick request credit card transactions. The processing fees incurred each time a customer pays an invoice or quick request online are as follows:

Cards

Visa, Mastercard, Discover, American Express

2.99%

Digital wallets

Apple Pay, PayPal, and Venmo

2.99%

ACH bank payments

Electronic money transfers that pull money from a customer’s bank account into yours.

Furthermore, you can check this article to learn how to manually add service fees to invoices in QuickBooks: Manually add service fees to invoices. 

In addition, feel free to visit these handy articles for future reference in managing your invoices:

• Customize invoices, estimates, and sales receipts in QuickBooks Online.
• Record invoice payments in QuickBooks Online.

You can always reach out if you have any other questions or concerns about payments and invoices in QuickBooks Self-Employed. Leave a comment below, and I'll be more than happy to assist you. Take care and have a great day!