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событие не описано

woocommerce_(id)_shipping_add_rate хук-событие . WC 1.0

Developers can add additional flat rates based on this one via this action since @version 2.4.

Previously there were (overly complex) options to add additional rates however this was not user. friendly and goes against what Flat Rate Shipping was originally intended for.

Использование

add_action( 'woocommerce_(id)_shipping_add_rate', 'action_function_name_8300', 10, 2 );
function action_function_name_8300( $that, $rate ){
	// action...
}
$that
-
$rate
-

Где вызывается хук

WC_Shipping_Flat_Rate::calculate_shipping()
woocommerce_(id)_shipping_add_rate
woocommerce/includes/shipping/flat-rate/class-wc-shipping-flat-rate.php 216
do_action( 'woocommerce_' . $this->id . '_shipping_add_rate', $this, $rate );

Где используется хук в ядре WooCommerce

woocommerce/includes/shipping/legacy-flat-rate/class-wc-shipping-legacy-flat-rate.php 41
add_action( 'woocommerce_flat_rate_shipping_add_rate', array( $this, 'calculate_extra_shipping' ), 10, 2 );