php - WooCommerce trigger a function on order status complete -

i trying trigger function when order completed. using code:

add_action('woocommerce_order_status_completed', array($this,    'payment_complete'  ), 1); 

and function:

public function payment_complete($order_id) {    $this->generate_order_file($order_id);  } 

this function meant generate order file, it's not being called @ all. tried getting add message error log,

i using woocommerce order status control plugin, , orders automatically changing complete upon payment. yet reason woocommerce_order_status_completed action isn't triggering.

i can recommend using query monitor - https://wordpress.org/plugins/query-monitor/ - see hooks have fired on page.