Will retrieve the user information data for the authenticated user.
        :type access_token: str
        :rtype: dict[str, str]

        :param access_token: The access token to be used to retrieve the data.
        :return: Dictionary with attribute name as key and attribute value as value.

def user_information(self, access_token):
        """
        Will retrieve the user information data for the authenticated user.
        :type access_token: str
        :rtype: dict[str, str]

        :param access_token: The access token to be used to retrieve the data.
        :return: Dictionary with attribute name as key and attribute value as value.
        """
        payload = {'access_token': access_token}
        url = "https://graph.facebook.com/v2.5/me"
        if self.config["fields"]:
            payload["fields"] = ",".join(self.config["fields"])
        resp = requests.get(url, params=payload)
        data = json.loads(resp.text)
        try:
            picture_url = data["picture"]["data"]["url"]
            data["picture"] = picture_url
        except KeyError as e:
            pass
        return data