The Opkee system is a complete payment solution. By adding information on transactions with the Opkee token directly into the blockchain, it is possible to associate a payment to a specific product, a purchase order or anything else that can be bought. This token contains additional features to the ERC20 that can help you in many situations, including managing subscriptions and unlocking paid content (an article, a video, a file or any other media).
The project is just starting with a huge potential.