PERMISSION_DENIE 'cloudmessaging.messages.create' denied on resource

[arunagirinathan]

FCM http v1 :  Getting  error  https://fcm.googleapis.com/v1/projects/mynpstpushnotify/messages:send

through postman or resttemplate  getting below error

403 FORBIDDEN - {
"error": {
"code": 403,
"message": "Permission 'cloudmessaging.messages.create' denied on resource '//cloudresourcemanager.googleapis.com/projects/mynpstpushnotify' (or it may not exist).",
"status": "PERMISSION_DENIED",
"details": [
{
"@type": "type.googleapis.com/google.rpc.ErrorInfo",
"reason": "IAM_PERMISSION_DENIED",
"domain": "cloudresourcemanager.googleapis.com",
"metadata": {
"resource": "projects/mynpstpushnotify",
"permission": "cloudmessaging.messages.create"
}
}
]
}