Individuals and Businesses can now pay their taxes at any Canada Post Outlet for a fee using cash or a debit card. This includes personal and corporate tax, source deductions, GST/HST amounts and other balances. To do so, a QR code must be generated using CRA's online service. The website indicates that the day the payment is made at the post office is the day CRA will consider the payment made.
For more information, see https://www.canada.ca/en/revenue-agency/corporate/about-canada-revenue-agency-cra/pay-canada-post.html.