Cod Black Ops III: here's how to download the beta without code
The operation is feasible either directly from the console, from the web. From the console you can just go into the settings and set Japanese language and country Japan, after which you will have to enter the store and search for "Black Ops III": the demo will appear in the results list and from there you can download it, although obviously you'll have to remember which buttons to push since the signs are in Japanese.
The second way you can do that from your PC:
1-go to Exchange country page of Xbox.com
2-click on "日本 (Japan)"
3-go to the beta page and click the green button to purchase. In the next window, confirm (button down)
4-go back to Exchange country page of Xbox.com and set the Italian language
This is done, you should find the beta download on your console. We advise you to hurry, because we don't know if Microsoft or Activision intervene to block this system. Have fun!