WordPress at a glance
action is not described

woocommerce_payment_complete action-hook . WC 1.0

Usage

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

Where the hook is called

WC_Order::payment_complete()
woocommerce_payment_complete
woocommerce/includes/class-wc-order.php 121
do_action( 'woocommerce_payment_complete', $this->get_id() );

Where in WP core the hook is used WooCommerce

woocommerce/includes/wc-stock-functions.php 112
add_action( 'woocommerce_payment_complete', 'wc_maybe_reduce_stock_levels' );
woocommerce/includes/wc-stock-functions.php 384
add_action( 'woocommerce_payment_complete', 'wc_release_stock_for_order', 11 );
woocommerce/includes/wc-user-functions.php 299
add_action( 'woocommerce_payment_complete', 'wc_paying_customer' );