The Public Test Network is the pre-production test network of the Open Charging Network. It should be used to test services in a robust QA environment. The Share&Charge Foundation also uses it to test planned features of the Open Charging Network.
If you want to run your own node connected to the Public Test Network, please visit the following page to learn more: Running a Node (Test Network)
Please note, that it is not advised to run a service in production on the Public Test Network. The Share&Charge Foundation reserves the right to make changes to the testing components on this environment, that could affect your service.