Woocommerceのcheckout process時のhook

woocommerce_checkout_process

例:

// define the woocommerce_checkout_process callback 
function action_woocommerce_checkout_process( $wccs_custom_checkout_field_pro_process ) { 
    // make action magic happen here... 
}; 
         
// add the action 
add_action( 'woocommerce_checkout_process', 'action_woocommerce_checkout_process', 10, 1 ); 

参照元:http://hookr.io/actions/woocommerce_checkout_process