Validate the user and token, returns the Requests response.

def validate(self):
        """Validate the user and token, returns the Requests response."""

        validate_url = "https://api.pushover.net/1/users/validate.json"

        payload = {
            'token': self.api_token,
            'user': self.user,
        }

        return requests.post(validate_url, data=payload)