/**
  * Creates a new instance of Feedback using Smark.io supplierId+externalId as lead key
  *
  * @param $api_token string your API token
  * @param $supplierId string|int the identifier of the supplier in Smark.io
  * @param $externalId string|int the identifier of the lead for the supplier.
  * @param $status string the status of the lead
  * @return Feedback
  */
 public static function createWithSupplierExternalId($api_token, $supplierId, $externalId, $status)
 {
     $feedback = new self($api_token);
     $feedback->setSupplierId($supplierId);
     $feedback->setExternalId($externalId);
     $feedback->setStatus($status);
     return $feedback;
 }