App Engine Admin API Error - The "appengine.applications.create" permission is required - google-app-engine

Question

We would like to automatically create a project ID and install our ULAPPH Cloud Desktop application using the App Engine Admin API (REST) and Golang.
https://cloud.google.com/appengine/docs/admin-api/?hl=en_US&_ga=1.265860687.1935695756.1490699302
https://ulapph-public-1.appspot.com/articles?TYPE=ARTICLE&DOC_ID=3&SID=TDSARTL-3
We were able to get a token but when we tried to create a project ID, we get the error below.
[Response OK] Successful connection to Appengine Admin API.
[Token] { "access_token" : "TOKEN_HERE", "expires_in" : 3599, "token_type" : "Bearer" }
[Response Code] 403
[Response Body] { "error": { "code": 403, "message": "Operation not allowed", "status": "PERMISSION_DENIED", "details": [ { "#type": "type.googleapis.com/google.rpc.ResourceInfo", "resourceType": "gae.api", "description": "The \"appengine.applications.create\" permission is required." } ] } }
We are just using the REST API calls. Request for token was successful as you can see above and the scope is ok as well. Now, when we posted the request to create application, we are having the error that says "appengine.application.create" permission required.
How do we specify the permission?
What are the possible reasons why we are getting that error? Do we missed to send a field in JSON or in query?
As per below link, we just need to pass the json containing the id and location. We also just need to pass the token in the Authorization header. The same logic I have used successfully in accessing Youtube, Drive APIs etc so not sure what needs to be done since I have followed the docs available.
I have also posted the same issue in Google Groups and now waiting for their reply.

Answer 1

It seems you've given no details about how you set up the account you're using to authorize the request. You'll need to make sure the appengine.applications.create permission is given to the account you're using, as mentioned in the error text. You can use the Google Identity and Access Management (IAM) API for this.
(by the way, I'd given this answer in the original thread, although you didn't reply or seem to take action on it. check it out! this is likely the solution you need!)