WooCommerce | Force orders to auto complete

force-woocommerce-orders-to-automatically-complete.php

<?php

/**
 * Auto Complete all WooCommerce orders.
 */
add_action( 'woocommerce_thankyou', 'custom_woocommerce_auto_complete_order' );
function custom_woocommerce_auto_complete_order( $order_id ) { 
	if ( ! $order_id ) {
		return;
	}
	$order = wc_get_order( $order_id );
	$order->update_status( 'completed' );
}

There are certain instances when the store owner wants orders to be automatically approved.

I’ve had to use this on a paid subscription membership site (to auto enroll people in a LearnDash course) and FooEvents (to automatically send people their tickets)