ATO - Supplier, Customer or Other

Hi All, When dealing with the ATO to make GST Liability payments or receiving GST Refunds, should the ATO be treated as a Customer, Supplier or Other?

Don’t know if its right, but after transitioning from Quickbooks I have the ATO as a Supplier.
So far it has worked for me.for the last 7 years.

I don’t think it makes any difference as ATO payments / receipts have no tax code and are not reported to the ATO as income or expenses.