If my invoice is for $250.00 and the QB payment fee is $7.50, does the $7.50 include GST?
The $7.50 is solely a processing fee, qboadmin.
It does not include GST or any other tax. You can read more details about the fees in this article: Intuit payments pricing schedule - Canada.
You can also check out these articles as well for additional guidance when accepting online payments from your customers:
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