Some PayPal transactions off by $0.01, $0.02

Paypal: Website Payments Standard

CS-Cart: Version 2.0.15



I am experiencing an inconsistent defect after some (very few) customers process their payment via PayPal.



Example Order 1:

CS-Cart calculate the total cost as $63.19. When the transaction details are transferred to PayPal, the total amount is captured as $63.18. Shipping is included in the cost by CS-Cart. Tax rate is 13%.



Example Order 2:

CS-Cart calculates the total cost as $71.93. When the transaction details are transferred to PayPal, the total amount is captured as $71.95. No shipping. Tax rate is first calculated at 13% with a rebate of 8% applied by CS-Cart.



In both examples, different products were ordered, different tax rules apply and one used shipping while the other did not.



All transactions are in Canadian funds.



I realize that one solution may be to upgrade my CS-Cart installation. I am open to the idea, but would prefer not to at this time; I don’t have the time to fix any conflicts with my customized skin.