public function toOptionArray()
    {
        $return = [];

        $paymentMethodCodes = $this->_installmentsHelper->getAllInstallmentPaymentMethodCodes();
        foreach ($paymentMethodCodes as $paymentMethodCode) {
            $return[] = [
                'value' => $paymentMethodCode,
                'label' => ucfirst(str_replace('_', ' ', $paymentMethodCode))
            ];
        }
        return $return;
    }