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Welcome to the Community, @Taro-sushtato-c.
For now, there is no direct way for connecting TOAST and QuickBooks Online. However, you can use a third party application at the App Center that can help you bridge two programs.
I also recommend contacting 3rd party app support so you’ll be guided on connecting QuickBooks Online to POS system TOAST so you can track your sales and taxes.
You can also use this article if you need some information or procedures that will help you while using QuickBooks Online. Help articles.
Please let me know if you need further assistance in connecting 3rd party app. I am here to help. Have a nice day!