You can contribute to wako via PayPal.

Please donate at least 15€ 11€ and write your trakt's profile URL in the PayPal message, I will add you a manual life time subscription (you will receive a push notification in wako to let you know it's been took care of).
Once done, you'll have to clear wako's cache (inside wako > settings > clear cache) and restart the app. That's it.

Get it on Google Play
Get it on Apple Store