/**
* ensureCouponIsValid
* @param string $params
* @return boolean
*/
public function assertCouponIsValid($token, $coupon_code, $coupon_value, $coupon_type)
{
//first call the parent function
parent::assertCouponIsValid($token, $coupon_code, $coupon_value, $coupon_type);
//get the session_id associated with the token
$session_id = $this->getSessionId($token);
//make sure the session is valid
if ($session_id === null) {
throw new Exception(SyC::t('sdk', 'Token not found'));
}
//resume the session
session_destroy();
session_id($session_id);
session_start();
$this->loadSessionData();
}