woocommerce_payment_complete action-hook . WC 1.0

add_action( 'woocommerce_payment_complete', 'action_function_name_6796' );
function action_function_name_6796( $id ){
	// action...
}

woocommerce_payment_complete

do_action( 'woocommerce_payment_complete', $this->get_id() );

add_action( 'woocommerce_payment_complete', 'wc_maybe_reduce_stock_levels' );

add_action( 'woocommerce_payment_complete', 'wc_release_stock_for_order', 11 );

add_action( 'woocommerce_payment_complete', 'wc_paying_customer' );