Generate Device Token

Story

As App user (Notifier)
I want my app to be identified on the platform
So that the interaction between my app and the platform will be enabled

Acceptance Criteria

• At startup the app checks whether it has a valid Device Token (or: check the response of the first API call for an Invalide Device Token error and react on that, or at the start of each new notification process, just request a new Device Token)
• The request POST /v2/devices is executed with the application token in the header.
• The response contains the device token which is stored within the app
• A device token needs to be stored securely, because this gives full access to the incident data