Integration Guide

Express Checkout ~ Integration Overview
8/16/2013 Page 16 of 18
 The net amount of the refund, which is deducted from your balance.
 To issue a refund:
 In the RefundTransaction request, specify the transaction ID of the
original transaction which you want to refund.
TRANSACTIONID=transaction_id
 Specify the kind of refund, which is either Full or Partial.
REFUNDTYPE=Full
Or
REFUNDTYPE=Partial
 For a partial refund, specify the refund amount, including the currency.
AMT=amount
CURRENCYCODE=currencyID
 For a partial refund, specify the memo description.
NOTE=description
 Execute the RefundTransaction operation.
 Check the acknowledgement status in the RefundTransaction response
to ensure that the operation was successful (ACK=Success).
Managing Response Codes
Possible error codes returned by each of the PayPal APIs can be found in an online list of API
Error Codes.
 The error codes are broken out by API.
 The documentation includes both the Short and Long Message for each error
and, where appropriate, a possible corrective action to be taken.
Testing Your Integration
 To test your integration, PayPal provides a Sandbox for you to use to ensure
that your integration is working properly before releasing it to your buyers.
The Sandbox environment is a duplicate of the live PayPal environment,
except no money changes hand. You will need to sign up for a Sandbox
account in order to use this environment. For more information and to sign
up for a Sandbox account, please see the PayPal Sandbox Guide.