How get my platform switching code?

The platform switching code give you access to a discount if you have already activated a book edition on a device and you are now using a new device running a different platform (operating system).

To get this code, you need to touch the About item in the main menu.
At the top of the displayed screen, you can see the application version and below can be displayed the platform switching code.
If you can't see the code, it could be because the book is not unlocked or have been unlocked using a platform switching code.