Remove UserDefaults and registering "if needed"
Unregister token
Code cleanup
Build JSON with custom "user" property
Optional Completion handler for register method.
Corrected log messages
Merge branch 'daniel/json_change' into dev

* daniel/json_change:
  Corrected log messages
  Optional Completion handler for register method.
  Build JSON with custom "user" property
  Code cleanup
  Unregister token
  Remove UserDefaults and registering "if needed"
Nomenclature alterations