App store Connect API using Python Package returns 401

from appstoreserverlibrary.api_client import AppStoreServerAPIClient, APIException
from appstoreserverlibrary.models.Environment import Environment

with open("AUTHKEYLOCATION" ,'rb') as f:
    private_key = f.read()
key_id = "KEYID"
issuer_id = "ISSUER_ID"
bundle_id = "BUNDLEID"
environment = Environment.SANDBOX

client = AppStoreServerAPIClient(private_key, key_id, issuer_id, bundle_id, environment)


class IosRTDN (APIView):
    #permission_classes = [ IsAuthenticated]

    def get(self,request):
        try:
            response = client.request_test_notification()
            print(response)

            return Response(response)
        except APIException as e:
           return Response({
        'error': str(e)
    })

Using this implementation of the python package from here, it still get a 401 response, from what i see from other implementation ie: JWT, you need a timestamp

do you need timestamp too in this case, and where should i put it then?