Order status with PayPal setting to processing

Hi,

I have a virtual product which uses the hook ‘woocommerce_payment_complete’ to create a user on a 3rd party system. This is working OK when using a coupon for testing i.e. there is no cost in the basket. But using PayPal it is not being called.
I have switched on logging for PayPal and then final log messages for each order are
06-13-2017 @ 18:12:39 – Received valid response from PayPal
06-13-2017 @ 18:12:39 – Found order #5334
06-13-2017 @ 18:12:39 – Payment status: completed
However the order is always set at processing rather than complete.
I maybe using the wrong hook or need to set something to set the payment to complete. Any pointers would be appreciated. Thanks.