woocommerce_shipping_chosen_method filter-hookWC 1.0

Usage

add_filter( 'woocommerce_shipping_chosen_method', 'wp_kama_woocommerce_shipping_chosen_method_filter', 10, 3 );

/**
 * Function for `woocommerce_shipping_chosen_method` filter-hook.
 * 
 * @param  $default       
 * @param  $package_rates 
 * @param  $chosen_method 
 *
 * @return 
 */
function wp_kama_woocommerce_shipping_chosen_method_filter( $default, $package_rates, $chosen_method ){

	// filter...
	return $default;
}
$default
-
$package_rates
-
$chosen_method
-

Where the hook is called

wc_get_default_shipping_method_for_package()
woocommerce_shipping_chosen_method
woocommerce/includes/wc-cart-functions.php 462
return apply_filters( 'woocommerce_shipping_chosen_method', $default, $package['rates'], $chosen_method );

Where the hook is used in WooCommerce

woocommerce/src/Blocks/Shipping/ShippingController.php 80
add_filter( 'woocommerce_shipping_chosen_method', array( $this, 'prevent_shipping_method_selection_changes' ), 20, 3 );