Mark orders complete automatically in WooCommerce

Sometimes ticket sellers using WooCommerce want orders to be marked "complete" automatically - without any manual intervention. The team over at WooThemes have helpfully provided a snippet to achieve exactly this:

If it's something you want to do, check it out and see if it helps!

(...and please note that we're linking to this because we think it could be really helpful for a number of our users - but any further questions or queries should be addressed to the team at WooThemes.)