I'm able to get the new token-based push working (without using certificates) just fine with normal push notifications and using a simple node.js file for the backend.
But, I can't get it to work with VoIP push. I've tried just using the token derived from PushKit - creditials.token but I always get a 400 error.
I can't seem to find any info on this online. Just the mention from WWDC that token-based auth could also be used for VoIP push.