I feel like they should implement the subscription based payment asap and hope it works with facebook login. They'd still get money and we won't have to wait a very long time for key. I know some people, especially new users, have 3 and more hours waiting time for one key. The game has good replay value, but I don't think people would pay for keys everytime they want to restart a play through. Their biggest keys package which contains 150 keys can only last 9 books with around 16 chapters each book.