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It depends on which processor you choose. By default you may sign up to QuickBooks Payment.
As backup option, you may utilize MP to process ACH payment for free.
I'm happy to clarify if there's fess for payment processing. At this time there's a 1% fee if the invoice is paid through bank transfers (ACH) as well as a few others fees from credit cards listed below.
You can find this info and much more at the following article: QuickBooks Payment Pricing.
Please check this article on how to contact QuickBooks Payment team for additional information on Payment Support.
If there's anything else I can help with, feel free to post below.
Thanks for your time and have a nice weekend.