[google-cloud-sql-discuss] Testing Cloud SQL Failover

I've been trying to test SQL failover using the following command:

curl --header 'Content-Type: application/json' --header 'Authorization: Bearer OATH_ACCESS_TOKEN_HERE' -X POST "https://www.googleapis.com/sql/v1beta4/projects/numeric-datum-118114/instances/asia-east1:db-master/failover" --data "{}"

I started with the command here:

https://cloud.google.com/sql/docs/high-availability#test

but it seems to be a bit off the mark. Eventually I ended up with the curl command above but I keep getting the following response:

{
 "error": {
  "errors": [
   {
    "domain": "global",
    "reason": "authError",
    "message": "Invalid Credentials",
    "locationType": "header",
    "location": "Authorization"
   }
  ],
  "code": 401,
  "message": "Invalid Credentials"
 }
}

The actual access token I'm using in the curl command is the one returned by:

gcloud auth login

I'm assuming this is the wrong thing to do? 

How do I acquire an access token that allows me to make this call?

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