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Thanks for coming in, user45353.
A2X is a third party application integrated in your QuickBooks Online (QBO). Thus, there is a separate charges for both products.
Here's an article that provides common charge reasons in QuickBooks: Charges on your credit card or bank account.
Feel free to read through this article about how A2X works with QBO: Do More with Apps: A2X for Amazon.
You can also reach out to our QuickBooks Care Team if you need more help verifying the charges. Below are the instructions on how to reach us:
I've got your back if you need more help. I'm always happy to lend a hand. Have a good one.