Complete paid orders of virtual products

<?php

add_filter(
	'woocommerce_payment_complete_order_status',
	static function ( $status, $order_id, $order = null ) {
		$order = $order instanceof WC_Order ? $order : wc_get_order( $order_id );
		if ( 'processing' !== $status || ! $order ) {
			return $status;
		}
		foreach ( $order->get_items() as $item ) {
			$product = $item instanceof WC_Order_Item_Product ? $item->get_product() : null;
			if ( ! $product || ! $product->is_virtual() ) {
				return $status;
			}
		}
		return 'completed';
	},
	10,
	3
);