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Asked: 2026-06-17T08:00:29+00:00

I am trying to integrate payapl through sandbox for my website. I am able

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I am trying to integrate payapl through sandbox for my website.

I am able to send multiple items to paypal and it works fine. however i want to set CART-WIDE shipping cost and send it to paypal.

I am getting error code:

10413 ("ErrorCode=10413&Desc=Transaction refused because of an invalid argument. See additional error messages for details.& Desc2=The totals of the cart item amounts do not match order amounts.")

My CART:
Item: Mens Jackets
Price: 14.99
DESC: "SAMPLE"
QTY: 1
ITEM TOTAL: 14.99
SHIPPING: 5.99

CART TOTAL: 20.94

I am setting the following variables and i dont know what i am doing wrong.

NVPCodec encoder = new NVPCodec();
                        encoder["METHOD"] = "SetExpressCheckout";
                        encoder["RETURNURL"] = returnURL;
                        encoder["CANCELURL"] = cancelURL;
                        encoder["BRANDNAME"] = "Mountain Warehouse Sample Application";
                        encoder["PAYMENTREQUEST_0_PAYMENTACTION"] = "Sale";
                        encoder["PAYMENTREQUEST_0_CURRENCYCODE"] = "GBP";

                        // Get the Shopping Cart Products
                        int i = 0;
                        Decimal totalItemAmt = 0.00M;
                        string cartShippingAmt = "";
                        foreach (BasketItem item in basket.Items)
                        {
                                    if (item.OrderItemType == OrderItemType.Product)
                                    {
                                                encoder["L_PAYMENTREQUEST_0_NAME" + i] = item.Name.ToString();
                                                encoder["L_PAYMENTREQUEST_0_AMT" + i] = item.Price.ToString("0.00");
                                                encoder["L_PAYMENTREQUEST_0_QTY" + i] = item.Quantity.ToString();
                                                i++;
                                                totalItemAmt += Convert.ToDecimal(item.Price.ToString("0.00"));
                                    }

                                    if (item.OrderItemType == OrderItemType.Shipping)
                                    {
                                                cartShippingAmt = item.Price.ToString("0.00");
                                    }
                        }

                        encoder["PAYMENTREQUEST_0_ITEMAMT"] = totalItemAmt.ToString();
                        encoder["PAYMENTREQUEST_0_AMT"] = amt;
                        encoder["HANDLING_CART"] = cartShippingAmt;

Here is the query that gets send to paypal

METHOD=SetExpressCheckout&
RETURNURL=http%3a%2f%2flocalhost%3a1234%2fCheckout%2fCheckoutReview.aspx&
CANCELURL=http%3a%2f%2flocalhost%3a1234%2fCheckout%2fCheckoutCancel.aspx&
BRANDNAME=Sample+Application&
PAYMENTREQUEST_0_PAYMENTACTION=Sale&
PAYMENTREQUEST_0_CURRENCYCODE=GBP&
L_PAYMENTREQUEST_0_NAME0=MENS+JACKETS&
L_PAYMENTREQUEST_0_AMT0=14.99&
L_PAYMENTREQUEST_0_QTY0=1&
PAYMENTREQUEST_0_ITEMAMT=14.99&
HANDLING_CART=5.95&
PAYMENTREQUEST_0_AMT=20.94

I think i am assigning wrong variable Shipping cost for entire cart.

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1 Answer

  1. Editorial Team

    You’ve got a few things wrong here.

    First, some of the request parameters you’re using aren’t right. HANDLING_CART is not a valid request parameter. I think what you’re looking for there is HANDLINGAMT (which would actually be PAYMENTREQUEST_0_HANDLINGAMT).

    In each payment, the total of ITEMAMT + SHIPPINGAMT + HANDLINGAMT + TAXAMT needs to equal AMT. In your case, PayPal is ignoring the invalid parameter you’re sending, so it ends up seeing the following…

    PAYMENTREQUEST_0_ITEMAMT = 14.99
    PAYMENTREQUEST_0_AMT = 20.94

    It’s not seeing your handling amount because that parameter is invalid, therefore, the totals don’t match up according to what they’re seeing. You just need to change HANDLING_CART to PAYMENTREQUEST_0_HANDLINGAMT and that should fix your issue.

    Here’s a sample of a working SetExpressCheckout request with multiple items and some additional options included…

    [USER] => ****
[PWD] => ****
[VERSION] => 97.0
[BUTTONSOURCE] => AngellEYE_PHPClass
[SIGNATURE] => ****
[METHOD] => SetExpressCheckout
[MAXAMT] => 200.00
[RETURNURL] => http://paypal.angelleye.com/standard/samples/DoExpressCheckoutPayment.php
[CANCELURL] => http://paypal.angelleye.com/paypal/class/cancel.php
[ALLOWNOTE] => 1
[HDRIMG] => http://paypal.angelleye.com/images/hdrimg.jpg
[SOLUTIONTYPE] => Sole
[LANDINGPAGE] => Billing
[BRANDNAME] => Angell EYE
[CUSTOMERSERVICENUMBER] => 555-555-5555
[GIFTMESSAGEENABLE] => 1
[GIFTRECEIPTENABLE] => 1
[GIFTWRAPENABLE] => 1
[GIFTWRAPNAME] => Box with Ribbon
[GIFTWRAPAMOUNT] => 2.50
[BUYEREMAILOPTIONENABLE] => 1
[SURVEYQUESTION] => Did you like this checkout?
[SURVEYENABLE] => 1
[BUYERREGISTRATIONDATE] => 2012-07-14T00:00:00Z
[L_SURVEYCHOICE0] => Yes
[L_SURVEYCHOICE1] => No
[PAYMENTREQUEST_0_AMT] => 100.00
[PAYMENTREQUEST_0_CURRENCYCODE] => USD
[PAYMENTREQUEST_0_ITEMAMT] => 80.00
[PAYMENTREQUEST_0_SHIPPINGAMT] => 15.00
[PAYMENTREQUEST_0_TAXAMT] => 5.00
[PAYMENTREQUEST_0_DESC] => This is a test order.
[PAYMENTREQUEST_0_NOTETEXT] => This is a test note before ever having left the web site.
[PAYMENTREQUEST_0_PAYMENTACTION] => Sale
[L_PAYMENTREQUEST_0_NAME0] => Widget 123
[L_PAYMENTREQUEST_0_DESC0] => Widget 123
[L_PAYMENTREQUEST_0_AMT0] => 40.00
[L_PAYMENTREQUEST_0_NUMBER0] => 123
[L_PAYMENTREQUEST_0_QTY0] => 1
[L_PAYMENTREQUEST_0_ITEMURL0] => http://www.angelleye.com/products/123.php
[L_PAYMENTREQUEST_0_NAME1] => Widget 456
[L_PAYMENTREQUEST_0_DESC1] => Widget 456
[L_PAYMENTREQUEST_0_AMT1] => 40.00
[L_PAYMENTREQUEST_0_NUMBER1] => 456
[L_PAYMENTREQUEST_0_QTY1] => 1
[L_PAYMENTREQUEST_0_ITEMURL1] => http://www.angelleye.com/products/456.php
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