GST at 5%, and nothing provincial
Alberta has no provincial sales tax, so the only sales tax on your home-province sales is the federal GST, administered by the Canada Revenue Agency (CRA). That means one registration, one return and one set of due dates.
HelloBooks applies GST per invoice line, records GST on your purchases as input tax credits, and prepares your GST return figures from the posted entries. You file with the CRA.