When registering, the system will provide a QR code that will be your identification throughout the Way.
Obtaining your QR code is completely free.
Download the application to access it from your mobile phone. In the App you will have your QR code recorded, you can register all your way, get all the stamps you want, share your data with other travellers and friends and access many services that the way has prepared for you. The App is totally free. Have a nice Way.