We don't usually get GST refunds, only if we overpay. Like you, we only have to charge tax applicable to the location you're invoicing to.
As a self-employed person, I don't have to charge tax. Once I get past a certainly earnings level, it will be different. Until then, I don't need a business license or worry about GST. I don't think the government cares if you ever charge it, as long as you pay it.
Until I'm making over the set point per year, I only have to pay my personal taxes and deductions, at least as long as I'm operating under my name rather than a company name.
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