FCM Api was updated to v1, and now u can't pass key=<API_KEY> (once generated from FCM Console) header as before, now u should generate it by SDK com.google.api-client and there u should pass mystery SCOPES inside createScoped() method. Here is a lot of examples about it - without information about scopes. But what is this? where to get it? I can't to find any information about it. Please help me