public static function clicksToAds($amount): string
    {
        $amountAsString = (string)$amount;
        $isNegativeValue = false;
        if ('-' === $amountAsString[0]) {
            $isNegativeValue = true;
            // cut minus sign from negative value
            $amountAsString = substr($amountAsString, 1, strlen($amountAsString));
        }
        //add leading zeros
        $amountAsString = str_pad($amountAsString, 12, '0', STR_PAD_LEFT);
        // insert decimal separator
        $amountAsString = substr_replace($amountAsString, '.', strlen($amountAsString) - 11, 0);
        if ($isNegativeValue) {
            // prepend minus sign for negative value
            $amountAsString = '-' . $amountAsString;
        }
        return $amountAsString;
    }