order

• post > add-custom-data-to-woocommerce-order link > https://wisdmlabs.com/blog/add-custom-data-woocommerce-order/
• post > adding-custom-data-woocommerce-order-add-cart link > http://thewebfosters.com/adding-custom-data-woocommerce-order-add-cart/
• post > ajax-submit-on-woo-checkout link > https://businessbloomer.com/woocommerce-add-checkout-fees-based-on-radio-button-choice-ajax/