never seen this problem before on any other website but when we try to checkout via paypal express when trying to use a discount code we get an error

Transaction refused because of an invalid argument. See additional error messages for details.(10413)

I enabled paypal logging but the long message just says:

The totals of the cart item amounts do not match order amounts.

I have checked the magento configuration but I can't see anywhere I can remove this check like I can with other payment providers, any advice?

Theres an option to transfer cart line items over to paypal but that's set to "no"

please help.

  • Change that product price for testing and check again. Commented Jun 7, 2018 at 13:13
  • tried all sorts of products it's not product specific, im thinking it could be something to do with tax? I know there's a really old issue with magento calculations with tax vs paypal calculation?
    – Danielle
    Commented Jun 7, 2018 at 13:15
  • Try my solution and check again Commented Jun 7, 2018 at 13:19
  • Have you tried? Commented Jun 7, 2018 at 13:36
  • Have you got any solution? Commented Jun 8, 2018 at 4:55

1 Answer 1


You will have to create a custom module

Create an observer


Here is the function to add to the observer:

  public function addDiscountToPayPal($observer) {

        $paypalCart = $observer->getPaypalCart();

        if ($paypalCart) {
            $order = $paypalCart->getSalesEntity();
            $discountAmount = $order->getDiscountAmount();
            $paypalCart->updateTotal(Mage_Paypal_Model_Cart::TOTAL_DISCOUNT, $discountAmount);


  • Thanks for the advice, will try this and see if it works for us.
    – Danielle
    Commented Jun 8, 2018 at 8:41

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