/**
  * @param int                      $totalCount
  * @param CredentialResponseItem[] $items
  */
 private function __construct($totalCount, array $items)
 {
     Assert::integer($totalCount);
     Assert::isArray($items);
     Assert::allIsInstanceOf($items, 'Mailgun\\Resource\\Api\\Domain\\CredentialResponseItem');
     $this->totalCount = $totalCount;
     $this->items = $items;
 }