/**
  * Prepare selected options for simple subscription product
  *
  * @param  Mage_Catalog_Model_Product $product
  * @param  Varien_Object $buyRequest
  * @return array
  */
 public function processBuyRequest($product, $buyRequest)
 {
     $options = parent::processBuyRequest($product, $buyRequest);
     $option = $buyRequest->getData('adyen_subscription');
     $options['adyen_subscription'] = $option;
     return $options;
 }