public function cancel()
    {
        if (!isset($this->_links->self->href)) {
            return $this;
        }

        $body = null;
        if($this->client->usesOAuth()) {
            $body = json_encode([
                "testmode" => $this->mode === "test" ? true : false
            ]);
        }

        $result = $this->client->performHttpCallToFullUrl(
            MollieApiClient::HTTP_DELETE,
            $this->_links->self->href,
            $body
        );

        return ResourceFactory::createFromApiResult($result, new Subscription($this->client));
    }