WC_Shipping_Legacy_Flat_Rate::calculate_shipping()
Method: Calculate shipping.
Source: includes/shipping/legacy-flat-rate/class-wc-shipping-legacy-flat-rate.php:172
woocommerce_flat_rate_shipping_add_rate
Action Hook: Developers can add additional flat rates based on this one via this action since @version 2.4.
Source: includes/shipping/legacy-flat-rate/class-wc-shipping-legacy-flat-rate.php:255
WC_Shipping_Legacy_Flat_Rate::get_package_item_qty()
Method: Get items in package.
Source: includes/shipping/legacy-flat-rate/class-wc-shipping-legacy-flat-rate.php:264
WC_Shipping_Legacy_Flat_Rate::find_shipping_classes()
Method: Finds and returns shipping classes and the products with said class.
Source: includes/shipping/legacy-flat-rate/class-wc-shipping-legacy-flat-rate.php:280
WC_Shipping_Legacy_Flat_Rate::calculate_extra_shipping()
Method: Adds extra calculated flat rates.
Source: includes/shipping/legacy-flat-rate/class-wc-shipping-legacy-flat-rate.php:309