i think i’d categorize it as a transfer. but then you’d need to be vigilant when you actually bought something to ensure that transaction got categorized correctly.
OR
My Amazon purchases always carry a category of Amazon initially. Then I run the Amazon importer. And it gives me the option to properly categorize both spending and refunds.
If you did this, then you make all your deposits carry the category of Amazon and then sort out the real spending when you uploaded the CSV from Amazon.
Just some thots on options…