fkooman\OAuth\Client\Guzzle3Client::post PHP Method

    public function post($url)
    {
        $request = $this->client->post($url);
        $request->addPostFields($this->postFields);
        foreach ($this->headers as $k => $v) {
            $request->addHeader($k, $v);
        }
        return $request->send()->json();
    }