2007

Name-Value Pair API Developer Guide and Reference April 2007 27
Accepting PayPal in Express Checkout
Including Subtotals Using DoExpressCheckoutPayment
2
Here are examples of ITEMAMT and TAXAMT:
ITEMAMT = (L_AMT0 * L_QTY0) + (L_AMT1 + L_QTY1) + L_AMT2
TAXAMT = (L_TAXAMT0 * L_QTY0) + (L_TAXAMT1 * L_QTY1) + L_TAXAMT2
N OTE: If the line item details do not add up to ITEMAMT or TAXAMT, the line item details are
discarded, and the transaction is processed using the values of ITEMAMT or TAXAMT.
The ACK value in the response is set to SuccessWithWarning.
Including Subtotals Using DoExpressCheckoutPayment
If you want the PayPal user to see subtotals of item cost, shipping charges, handling charges,
and sales tax, include the following parameters in DoExpressCheckoutPayment:
z ITEMAMT
z SHIPPINGAMT
z HANDLINGAMT
z TAXAMT
N OTE: Be sure that the summed values of ITEMAMT, SHIPPINGAMT, HANDLINGAMT, and
TAXAMT equal the value of AMT. You cannot include a zero amount for any of these
fields, and you must set all of them.
Updating Order Details Using DoExpressCheckoutPayment
You may need to update order details on PayPal if the customer makes a change to the order
after returning to your order review page. If the change causes new values for one or more of
the following parameters, you need to update the order details on PayPal using
DoExpressCheckoutPayment:
EXAMPLE 2.11 Including Subtotals
Request
[requiredSecurityParameters]
&METHOD=DoExpressCheckoutPayment
TOKEN=EC-0EU150885J108392M&PAYERID=95HR9CM6D56Q2&PAYMENTACTION=Sale&AMT=6.24&
AMT=192.22&ITEMAMT=176.02&SHIPPINGAMT=14.34&HANDLINGAMT=1.10&TAXAMT=0.76
Response
[successResponseFields]
&TOKEN=EC-
0EU150885J108392M&TRANSACTIONID=29W817045L6797418&TRANSACTIONTYPE=expresscheck
out&PAYMENTTYPE=instant&ORDERTIME=2006-08-
23T16:20:22Z&AMT=192.22&CURRENCYCODE=USD&FEEAMT=5.87&TAXAMT=0.76&PAYMENTSTATUS
=Completed&PENDINGREASON=None&REASONCODE=None