If you are interested in developing a GeoCheckpointing application, using this simple API is a way which may help you to implement some great features.
Using the API you can:
Authenticate the user.
Download GeoCheckpoints data (coordinates, GCP name, description, etc.).
Let the user to log GCP visits.
To obtain API key and get the documentation, please send us a message with a brief description of the application you are going to develop.