rounding and paypal

I had a strange issue crop up today in a cart using paypal pro.
In testing, I had a product for $65, and used a coupon code for 99% off, which should give me a total of 0.65. This worked perfect in the cart page, and confirm page (ie subtotal, discounts etc all looked right).
However, when I submitted payment to paypal, it failed due to invalid itemTotal.
I looked in the xml sent to paypal, and it showed the itemTotal value as 0.6500000000001

Very strange!
Anyway, I did a temporary fix in PP-DirectPayment_PHP.php by changing the itemtotal in line 84 to read round($varvalueArray["itemtotal"],2)
instead of just $varvalueArray["itemtotal"]

However, I was wondering if there was a better fix for this.

Thanks,
Tom

you can edit it directly in the PP-DirectPayment_PHP.php page like you have done, or you can edit the code for the item total in the checkout / confirm page to format it to 2 decimal places.

Hi,
Glad I was on the right track.
I had tried formatting the cart subtotal on the checkout/confirm page, but that didnt work.
Probably because it is the subtotal before the discount is applied, and in the paypal script, its the order total after discount is applied that is passed on. So, I think the only way to fix it is to edit PP-DirectPayment_PHP.php

Thanks,
Tom