Pass an argument to a function via a graqphql mutation and return a new value

graphql.py

# Packages: Django-graphene, django
from graphene_django.types import DjangoObjectType
import graphene

class FetchTwilioToken(graphene.Mutation):
    # Define the arguments that are passed from the client in the mutation
    class Arguments:
        identity = graphene.String(required=True)
    # Define the arguments that might be returned that are not defined
    # elsewhere. Give them a graphene type
    new_token = graphene.String()

    def mutate(self, info, identity):
        # These two lines of code are just grabbing a JWT via an internal
        # package
        new_token_getter = GetTwilioAuthToken(identity)
        new_token = new_token_getter.fetchToken()
        return FetchTwilioToken(new_token=new_token)