Hello there, @pk-rocketconcret.
Welcome to the Community. Let me provide some information about your merchant fees concern in QuickBooks Online.
If you're referring to the discount fees, I recommend requesting a rate review from our team. This way, you'll be able to check the best offers for processing credit card transactions with QuickBooks Payments.
To request, please contact our Merchant Services Team. The support is available from 6:00 AM-6:00 PM Monday-Friday and 6:00 AM-3:00 PM Saturday.
Additionally, I recommend visiting the following article for a user to know more about accepting customer payments online: QuickBooks Payments FAQ.
Drop me a comment below if you have any other questions. I'll be happy to help you some more.