This is an extremely simple and naive software licensing server. It accepts a unique ID and returns whether the license is valid or not. It also logs all checkins.
Send an HTTP request to the /api/v1/checkin/{id} endpoint. If the {id} value has not been seen before, it will create a new license instance and return a 200 status code. The invalidated_at date can be set to a non-NULL value, after which requests for that license will be met with a 403 Forbidden status code.
License Server is open-sourced software licensed under the MIT license.