Pick all that apply

• 1Choice 1.

  The device token can change through a reinstall, a device restore, or an OS upgrade, so call registerForRemoteNotifications() on every launch and update the server when the token you get differs from the stored one

• 2Choice 2.

  registerForRemoteNotifications() can only be called after the user allows notification permission, and no token is issued while permission is denied

• 3Choice 3.

  Turning the token Data into a string with description gives a format that changed in iOS 13 and that the server can't read, so you have to convert the bytes to a hex string yourself

• 4Choice 4.

  When the user logs out, the server has to drop the mapping between that token and the account so another user's notifications don't arrive on this device

• 5Choice 5.

  A development (sandbox) token and a production token can go to the same APNs gateway