Orsdxy

I'm facing an issue where I'm adding a custom fee to totals and updating paypal with the following plugin:

class UpdateCustomFeeForOrderPayPal

{

    protected $_checkoutSession;

    const AMOUNT_SUBTOTAL = 'subtotal';

    public function __construct(

        MagentoCheckoutModelSession $checkoutSession

    ) {

        $this->_checkoutSession = $checkoutSession;

    }



    public function afterGetAmounts($cart,$result)

    {

        $quote = $this->_checkoutSession->getQuote();

        $paymentMethod = $quote->getPayment()->getMethod();

        $paypalMehodList = ['payflowpro','payflow_link','payflow_advanced','braintree_paypal','paypal_express_bml','payflow_express_bml','payflow_express','paypal_express'];



        // to check the paypal payment method

        if(in_array($paymentMethod,$paypalMehodList)){

            $result[self::AMOUNT_SUBTOTAL] = $result[self::AMOUNT_SUBTOTAL] + $quote->getFee();



        }



        return $result;

    }



    public function beforeGetAllItems($cart)

    {

        $quote      = $this->_checkoutSession->getQuote();



        $feePrice = $quote->getFee();



        if ($feePrice > 0) {

            $cart->addCustomItem(__("Extra Fee"), 1, $feePrice);

        }

    }

}

This unfortunately doesn't play well with PayPal, I'm getting the following response:

main.DEBUG: array (

  'url' => 'https://api-3t.sandbox.paypal.com/nvp',

  'SetExpressCheckout' => 

  array (

    'PAYMENTACTION' => 'Sale',

    'AMT' => '108.85',

    'CURRENCYCODE' => 'USD',

    'RETURNURL' => 'http://test.com/us/paypal/express/return/',

    'CANCELURL' => 'http://test.com/us/paypal/express/cancel/',

    'INVNUM' => 'US-00050186',

    'SOLUTIONTYPE' => 'Mark',

    'GIROPAYCANCELURL' => 'http://test.com/us/paypal/express/cancel/',

    'GIROPAYSUCCESSURL' => 'http://test.com/us/checkout/onepage/success/',

    'BANKTXNPENDINGURL' => 'http://test.com/us/checkout/onepage/success/',

    'SHIPPINGAMT' => '9.99',

    'ITEMAMT' => '85.43',

    'TAXAMT' => '7.99',

    'L_NUMBER0' => NULL,

    'L_NAME0' => 'ExtraFee',

    'L_QTY0' => 1,

    'L_AMT0' => '5.44',

    'BUSINESS' => NULL,

    'NOTETEXT' => NULL,

    'EMAIL' => 'test@gmail.com',

    'FIRSTNAME' => 'test',

    'LASTNAME' => 'test',

    'MIDDLENAME' => NULL,

    'SALUTATION' => NULL,

    'SUFFIX' => NULL,

    'COUNTRYCODE' => 'US',

    'STATE' => 'NY',

    'CITY' => 'New York',

    'STREET' => 'New York',

    'ZIP' => '10013',

    'PHONENUM' => '17623838372',

    'SHIPTOCOUNTRYCODE' => 'US',

    'SHIPTOSTATE' => 'NY',

    'SHIPTOCITY' => 'New York',

    'SHIPTOSTREET' => 'New York',

    'SHIPTOZIP' => '10013',

    'SHIPTOPHONENUM' => '17623838372',

    'SHIPTOSTREET2' => '',

    'STREET2' => '',

    'SHIPTONAME' => 'test test',

    'ADDROVERRIDE' => 1,

    'METHOD' => 'SetExpressCheckout',

    'VERSION' => '72.0',

    'USER' => '****',

    'PWD' => '****',

    'SIGNATURE' => '****',

    'BUTTONSOURCE' => 'Magento_Cart_Community',

  ),

  'response' => 

  array (

    'TIMESTAMP' => '2019-02-08T15:31:17Z',

    'CORRELATIONID' => 'de43685675249',

    'ACK' => 'Failure',

    'VERSION' => '72.0',

    'BUILD' => '51752370',

    'L_ERRORCODE0' => '10413',

    'L_SHORTMESSAGE0' => 'Transaction refused because of an invalid argument. See additional error messages for details.',

    'L_LONGMESSAGE0' => 'The totals of the cart item amounts do not match order amounts.',

    'L_SEVERITYCODE0' => 'Error',

  ),

)  

But the totals of the cart do match:
9.99 + 85.43 + 7.99 + 5.44 = 108.85

I don't understand what is the issue. Does anyone have an idea what's going on?