android - Where to find Reference_Ids for Firebase Cloud Messaging?

Question

After a lot of reading and Googling it seems I have made a complete setup for Google Cloud Messaging to send push-notifications. My missing link is the Reference_Ids that I must use to target apps. I have created a project and also added my apps to it.

When I send a push-request to GCM I get the following response:

{"multicast_id":7952352701122753715,"success":0,"failure":1,"canonical_ids":0,"results":[{"error":"InvalidRegistration"}]}
    StatusCode: 200, ReasonPhrase: 'OK', Version: 1.1, Content: System.Net.Http.StreamContent, Headers:
    {
      X-Content-Type-Options: nosniff
      X-Frame-Options: SAMEORIGIN
      X-XSS-Protection: 1; mode=block
      Alt-Svc: quic=":443"; ma=2592000; v="35,34"
      Vary: Accept-Encoding
      Transfer-Encoding: chunked
      Accept-Ranges: none
      Cache-Control: max-age=0, private
      Date: Wed, 21 Dec 2016 16:12:43 GMT
      Server: GSE
      Content-Type: application/json; charset=UTF-8
      Expires: Wed, 21 Dec 2016 16:12:43 GMT
    }

And the error reads "InvalidRegistration".

So my questions are:

• Where do I find my registration Ids?
• And as a related follow-up question, where do I find Registration_Ids for everyone using an app or a specific group or user?

BTW: I found a related question, but it does not seem to have an answer to as where to find these Ids. StackOverflow post.

Answer 1

Waitting for answers