Acquia\Cloud\Api\CloudApiClient::installDistro PHP Method

    public function installDistro($site, $env, $type, $source)
    {
        $variables = array('site' => $site, 'env' => $env, 'type' => $type, 'source' => $source);
        $request = $this->post(array('{+base_path}/sites/{site}/envs/{env}/install/{type}.json?source={source}', $variables));
        return new Response\Task($request);
    }