add_action( ‘woocommerce_order_status_completed’,

Hello Team I′m using this code
add_action( ‘woocommerce_order_status_completed’, ‘your_custom_function_call’, 10, 1);
to launch a customized php function, as the orders under subscriptions are on pending payment this code will not work. Please can you provide me a trigger for launching my function after the first subscription payment is completed?