woocommerce_checkout_shipping action-hook . WC 1.0
Usage
add_action( 'woocommerce_checkout_shipping', 'action_function_name_2901' ); function action_function_name_2901(){ // action... }
Where the hook is called
woocommerce_checkout_shipping
woocommerce/templates/checkout/form-checkout.php 44
<?php do_action( 'woocommerce_checkout_shipping' ); ?>
Where in WP core the hook is used WooCommerce
woocommerce/includes/class-wc-checkout.php 59
add_action( 'woocommerce_checkout_shipping', array( self::$instance, 'checkout_form_shipping' ) );