尝试woocommerce_thankyou 钩这将在成功接收订单后触发，无论用户如何付款。

$hook_to = \'woocommerce_thankyou\';
$what_to_hook = \'wl8OrderPlacedTriggerSomething\';
$prioriy = 111;
$num_of_arg = 1;    
add_action($hook_to, $what_to_hook, $prioriy, $num_of_arg);

function wl8OrderPlacedTriggerSomething($order_id){
      //do something...
}