GST/HST number Editorial Director October 28, 2021 12:59 Updated Follow Company registration and payment information (including the Canadian HST/GST number) can be found under "Contact Us". Related articles What is your DUNS number? VAT Identification number What is your IBAN or BIC? I am an Irish customer and require an Irish Tax Clearance Certificate to pay my invoices Can Someone Other Than the Author Pay an Invoice?