Shop Fitted Boutique review for Point of Sale

PSA: When you enter in an address to collect sales tax, they do not have the correct tax rate system. I entered my correct address, which on the government website has a 3.5% local sales tax rate, but because Shopify POS is super behind, they use a "Basic System" to determine the tax rate, which is 4% lower than it should have been, leaving ME to pay the remaining taxes out of pocket. I am not sure how this app is even legal if they cant even provide the correct tax rate!