Why does the product status not change to Completed for a digital product after online payment?

Question

WooCommerce

Variable products have been created, some of which are virtual-downloadable. But after paying for one such virtual downloadable product through an online payment, the status changes to Processing, due to which the Client does not receive a link to the product immediately. What is the problem?
The Autocomplete Orders plugin is not clear how it works. At least manually if you put the status Processing, then they do not change it to Completed

Answer 1

Because the payment gateway that you are using is written incorrectly or is not configured correctly.