I do not see it in the «PayPal October 2017» document: developer.alphacommercehub.com.au/docs/paypal-october-2017
Sample RefundPayment, not in the version on developer centre. Will follow-up
SAMPLE REFUNDPAYMENT
REQUEST
<TransactionRequest>
<Header>
<UserID>USER123</UserID>
<MerchantID>PayPalTest</MerchantID>
<TransactionType>RefundPayment</TransactionType>
<Version>2</Version>
</Header>
<Transaction>
<MerchantTxnID>20170202002</MerchantTxnID>
<Currency>USD</Currency>
<Amount>30000</Amount>
<Method>PP</Method>
</Transaction>
</TransactionRequest>
RESPONSE
<TransactionResponse>
<Result>
<ResponseCode>1000</ResponseCode>
<ResponseMessage>Request successful</ResponseMessage>
<ResponseTimestamp>02022017101248</ResponseTimestamp>
<MerchantID>PayPalTest</MerchantID>
<MerchantTxnID>20170202002</MerchantTxnID>
<Currency>USD</Currency>
<Amount>30000</Amount>
</Result>
<ProviderResps>
<ProviderResp>
<ProviderName>Paypal</ProviderName>
<ProviderOrder>1</ProviderOrder>
<ProviderResponse>Success</ProviderResponse>
</ProviderResp>
</ProviderResps>
<MethodResult/>
</TransactionResponse>