If you would like your end-users to be able to change the License Key for their installation to another existing License Key (for example to be able to use their existing in-app credits on a second device), you can provide them with a form to enter a different License Key and then use the License Modify request to validate that it is correct. When this request is successful, you should update any locally-stored License Key or in-app credit values with those returned.

Please note that you should only allow your end-users to use the same License Key on multiple devices where any data associated with that License Key is remotely stored.