PayPal payments - refunding orders

Does anyone here know how to refund money to users payed from my e-commerce site orders?

I mean .. I can surely go to my PP business account to 开发者_StackOverflow社区refund them manually, but I would like to know if PP API supports some kind of dynamic refund directly from my site..

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It looks possible read this.

PayPal API Docs

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you can use below code and API for your task.

$nvpStr = "&TRANSACTIONID=$transactionID&REFUNDTYPE=$refundType&CURRENCYCODE=$currencyID";

and then call this function:

$httpParsedResponseAr = PPHttpPost('RefundTransaction', $nvpStr);

for more details regarding that you can use below link : https://cms.paypal.com/cms_content/US/en_US/files/developer/nvp_RefundTransaction_php.txt