Wooden spoon to Fleabay. I've been pinged about $70 in GST across two purchases this January.
Nowhere can I access a Tax Invoice to save / print, let alone one showing the GST explicitly. Nor can I find a specific point-of-contact for GST enquiries on Fleabay.
That, IMO, puts them on par with Shonky Bob who says "Oh, I left my invoice book at home, I'll drop your tax invoice in on Monday" - and predictably never does.
It will be interesting to see where this ends up!