I was planning to send data messages (I do not mean notification messages!) to specific users via FCM. I tried the REST Api named ARC but since it is still in beta use it seems like there are still some issues that need to be fixed. I get "401 Unauthorized" all the time so I was looking for another way to get these messages to the users. How exactly am I supposed to send the requests to the Firebase-endpoint (https://fcm.googleapis.com/fcm/send)?
MY Request looks like this: Request
Thanks alot!