B4J Question Firebase REST API - send message need help with auth

[Alexander Stolte]

According to this:
"Starting from March 2020, FCM stopped creating legacy server keys. Existing legacy server keys will continue to work, but we recommend that you instead use the newer version of key labeled Server key in the Firebase console. "
They have updated the REST API to send messages to a device.

This is my code:

Build app server send requests | Firebase Cloud Messaging

firebase.google.com

'To send to a single, specific device, pass the device's registration token as shown.
'See the client setup information for your platform to learn more about registration tokens.
'https://firebase.google.com/docs/cloud-messaging/send-message#send-messages-to-specific-devices
Public Sub SendMessagesToSpecificDevices(token As String,body As String,title As String)
    
    Dim url As String = $"https://fcm.googleapis.com/v1/projects/${PROJECT_NAME}/messages:send"$
    
    Dim json As JSONGenerator
    json.Initialize(CreateMap("message":CreateMap("token":token,"notification":CreateMap("body":body,"title":title))))
    
    Dim j As HttpJob : j.Initialize("",Me)
    j.PostString(url,json.ToString)
    j.GetRequest.SetContentType("application/json")
    j.GetRequest.SetHeader("Authorization", "Bearer " & API_KEY)
    
    Wait For (j) JobDone(j As HttpJob)

End Sub

But this error comes:

ResponseError. Reason: , Response: {
  "error": {
    "code": 401,
    "message": "Request had invalid authentication credentials. Expected OAuth 2 access token, login cookie or other valid authentication credential. See https://developers.google.com/identity/sign-in/web/devconsole-project.",
    "status": "UNAUTHENTICATED"
  }
}

what am I doing wrong?

 

[DonManfred]

Expected OAuth 2 access token

So i guess you need to use OAuth2 class to start the OAuth-Flow and to receive the AccessToken.

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[Alexander Stolte]

So i guess you need to use OAuth2 class to start the OAuth-Flow and to receive the AccessToken.

but then I can't use the code on my server if I have to use oauth first?

 

[DonManfred]

You need to use oauth2 class to authenticate once.
if setup correctly the class can renew a token. Not sure if this works in a nonui app though.