Mfrhtyj

I was testing my online store and got this error when I used paypal to checkout:
PayPal gateway has rejected request. The totals of the cart item amounts do not match order amounts (#10413: Transaction refused because of an invalid argument. See additional error messages for details).

I have searched here but they relate to version 1.7 or 1.8. Is there a solution for 1.9.1?

In my experience this happens occasionally due to decimal rounding differences when multiple cart items are passed to Paypal. To avoid the error completely I disable the Transfer Cart Line items option.

You can try our fix:

https://github.com/magento-hackathon/PaypalRoundBugfix

Afaik the problem with

setting transfer cart line items to No

is, that PayPal doesn't then insure your stuff against the customer, so if you are a fraud, the customer doesn'T get their money back from paypal - AFAIK.

The issue you faced is related to Magento bug due to which the logic of actions of TAX calculation is performed in the wrong order.

To resolve the problem, you just need to navigate to file:

app/code/core/Mage/Sales/Model/Config/Ordered.php

find _getSortedCollectorCodes() function and replace with below code

protected function _getSortedCollectorCodes()

{

    if (Mage::app()->useCache('config')) {

        $cachedData = Mage::app()->loadCache($this->_collectorsCacheKey);

        if ($cachedData) {

            return unserialize($cachedData);

        }

    }

    $configArray = $this->_modelsConfig;

    // invoke simple sorting if the first element contains the "sort_order" key

    reset($configArray);

    $element = current($configArray);

    if (isset($element['sort_order']) && false) {

        uasort($configArray, array($this, '_compareSortOrder'));

        $sortedCollectors = array_keys($configArray);

    } else {



        $sortedCollectors = array_keys($configArray);



        foreach ($configArray as $code => &$data) {

            foreach ($data['before'] as $positionCode) {

                if (!isset($configArray[$positionCode])) {

                    continue;

                }

                if (!in_array($code, $configArray[$positionCode]['after'], true)) {

                    // Also add additional after condition for related total,

                    // to keep it always after total with before value specified

                    $configArray[$positionCode]['after'] = $code;

                }

                $currentPosition = array_search($code, $sortedCollectors, true);

                $desiredPosition = array_search($positionCode, $sortedCollectors, true);

                if ($currentPosition > $desiredPosition) {

                    // Only if current position is not corresponding to before condition

                    array_splice($sortedCollectors, $currentPosition, 1); // Removes existent

                    array_splice($sortedCollectors, $desiredPosition, 0, $code); // Add at new position

                }

            }

        }



        // Sort out totals with after position specified

        foreach ($configArray as $code => &$data) {

            $maxAfter = null;

            $currentPosition = array_search($code, $sortedCollectors, true);

            foreach ($data['after'] as $positionCode) {

                $maxAfter = max($maxAfter, array_search($positionCode, $sortedCollectors, true));

            }

            if ($maxAfter !== null && $maxAfter > $currentPosition) {

                // Moves only if it is in front of after total

                array_splice($sortedCollectors, $maxAfter + 1, 0, $code); // Add at new position

                array_splice($sortedCollectors, $currentPosition, 1); // Removes existent

            }

        }

    }



    if (Mage::app()->useCache('config')) {

        Mage::app()->saveCache(serialize($sortedCollectors), $this->_collectorsCacheKey, array(

                Mage_Core_Model_Config::CACHE_TAG

            )

        );

    }

    return $sortedCollectors;

}

Note : Please override core file. Do not change core file. Clear cache