req, err := newTestRequest(http.MethodPost, resource, 0, nil)
	if err != nil {
		return nil, err
	}

	// management REST API uses signature V4 for authentication.
	err = signRequestV4(req, cred.AccessKey, cred.SecretKey)
	if err != nil {
		return nil, err
	}
	return req, nil
}