invoiceninja/app/PaymentDrivers/Stripe/Utilities.php

<?php

/**
 * Invoice Ninja (https://invoiceninja.com).
 *
 * @link https://github.com/invoiceninja/invoiceninja source repository
 *
 * @copyright Copyright (c) 2021. Invoice Ninja LLC (https://invoiceninja.com)
 *
 * @license https://www.elastic.co/licensing/elastic-license
 */

namespace App\PaymentDrivers\Stripe;

trait Utilities
{
    /*Helpers for currency conversions, NOTE* for some currencies we need to change behaviour */
    public function convertFromStripeAmount($amount, $precision, $currency)
    {

        if($currency->code == "JPY")
            return $amount;

        return $amount / pow(10, $precision);

    }

    public function convertToStripeAmount($amount, $precision, $currency)
    {

       if($currency->code == "JPY")
            return $amount; 

        return round(($amount * pow(10, $precision)),0);

    }
}