It's great to hear that you're using QuickBooks Online Payments to speed up the process of collecting customer payments. I can explain the charges associated with processing credit cards.
When you accept payments via credit card, your processing fee equals $0.25 + 2.9% of the total amount of the invoice or sales receipt. You're not charged any GST or other sales taxes for processing payments. You can learn more about QuickBooks Online Payments by following this link: Accept Credit Cards & Payments Online
Please let me know if there's anything else I can help with!
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