<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def get_id_token(self, access_token, nonce):
 """ Return an ID token for the given Access Token. """


        claims_string = self.request.POST.get('claims')
        claims_request = json.loads(claims_string) if claims_string else {}

        return oidc.id_token(access_token, nonce, claims_request)