Hi,

the format for tokens received from InstanceID API have a slightly different format:

It's basically (prefix_string : RegistrationID).

Now, in order to be able to subscribe on a topic is it _really_ required to have a 'new' InstanceID token ? I could not find a _clear_ statement

I am asking because I'm working on the server hook to send topic request.

If the answer yes, only InstanceID tokens can subscribe, we need a little switch on the server (not a show stopper):

1) send /topics/{something} (should not affect 'old' tokens_

2) fallback: find tokens w/o the ':', so we can fallback to pure registration Id for "non-Instance ID " tokens

Thanks,

Matthias