Offices order in two ways: one arrangement that stands in a reception for a week, or many small ones delivered on the same morning.
Both are fine and both need a date and a contact. For a delivery of more than ten pieces we ask for a week of notice and we deliver before eleven in the morning, because a reception desk after three in the afternoon is not a reliable place to leave anything.
The invoice carries GST and the order goes through this site so that there is a reference. Settlement is by transfer like everything else here.