public function AddSubAccountCredits($credits, $notes, $creditType = \ElasticEmailEnums\CreditType::Email, $subAccountEmail = null, $publicAccountID = null) {
        return $this->sendRequest('account/addsubaccountcredits', array(
                    'credits' => $credits,
                    'notes' => $notes,
                    'creditType' => $creditType,
                    'subAccountEmail' => $subAccountEmail,
                    'publicAccountID' => $publicAccountID
        ));
    }