def parse_stack(self, global_params, region, stack):
        """
        Parse a single stack and fetch additional attributes

        :param global_params:           Parameters shared for all regions
        :param region:                  Name of the AWS region
        :param stack_url:               URL of the AWS stack
        """
        stack['id'] = stack.pop('StackId')
        stack['name'] = stack.pop('StackName')
        stack_policy = api_clients[region].get_stack_policy(StackName = stack['name'])
        if 'StackPolicyBody' in stack_policy:
            stack['policy'] = json.loads(stack_policy['StackPolicyBody'])
        self.stacks[stack['name']] = stack