/**
 * Create extension at Zuora
 *
 * @param AppStore_Extension_Model_Product $product
 * @throws Exception
 * @return string|null Product identifier
 */
public function createExtensionProduct($product)
{
    /** @var $customer Mage_Customer_Model_Customer */
    $customer = Mage::getModel('customer/customer')->load($product->getDeveloperId());

    if (!$product->getEditions()) {
        return;
    }

    foreach ($product->getEditions() as $edition) {
        if ($someHelper->isGoEdition($edition, $product)) {

            $product->setZuoraName($this->getZuoraName($product, $edition));
            $this->createExtensionProduct($product);
        }
    }
}