Tax and shipping

Always-on rule for tax-and-shipping  ·  Source

• Take tax rates from the store's configuration or its tax service. Do not invent a percent in the theme or the client.
• Store each tax line with its rate id and amount. Do not recompute a historical order from today's rate table.
• Respect inclusive versus exclusive catalog prices. Do not mix them on one order.
• Match shipping zones from the destination. A missing zone is not a free rate. A configured zero cost is a free method.
• Recalculate tax and shipping on the server when the address or the cart changes, and show both before payment.
• Persist the chosen shipping method id and the quoted amount on the order.
• In WooCommerce, use WC_Tax and WC_Shipping_Method. Do not write a second rate table in JavaScript.
• Refund tax from the tax that was stored on the refunded lines.