Opt-out contact

REQUIRED SCOPES <code>['contacts:write']</code><br>An opt-out contact means a contact being disabled for reaching out. In case a contact is currently opt-in, i.e. enabled, this request makes this contact unavailable for communication.<br><br> As a result, the current user cannot send messages to the contact from the application, which is also reflected with the following note on the current user’s side bar: <br><br> This contact has been opted-out and will not receive messages from local and tall-free numbers.<br><br> At the same time, the contact themselves can write to the user.