PHP – PayPal Refund Amount

This PHP example helps you to refund the amount using PayPal. This example uses curl, you would
need to modify it to use a different method such as fsock.

Code Example: Download Example
<?php
/**
 * Send HTTP POST Request
 *
 * @param     string     The API method name
 * @param     string     The POST Message fields in &name=value pair format
 * @return     array     Parsed HTTP Response body
 */
function PPHttpPost($methodName_, $nvpStr_) {
 global $environment;

 // Set up your API credentials, PayPal end point, and API version.
 $API_UserName = urlencode('my_api_username');
 $API_Password = urlencode('my_api_password');
 $API_Signature = urlencode('my_api_signature');
 $API_Endpoint = "https://api-3t.paypal.com/nvp";
 if("sandbox" === $environment || "beta-sandbox" === $environment) {
 $API_Endpoint = "https://api-3t.$environment.paypal.com/nvp";
 }
 $version = urlencode('51.0');

 // Set the curl parameters.
 $ch = curl_init();
 curl_setopt($ch, CURLOPT_URL, $API_Endpoint);
 curl_setopt($ch, CURLOPT_VERBOSE, 1);

 // Turn off the server and peer verification (TrustManager Concept).
 curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
 curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);

 curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
 curl_setopt($ch, CURLOPT_POST, 1);

 // Set the API operation, version, and API signature in the request.
 $nvpreq = "METHOD=$methodName_&VERSION=$version&PWD=$API_Password&USER=$API_UserName&
            SIGNATURE=$API_Signature$nvpStr_";

 // Set the request as a POST FIELD for curl.
 curl_setopt($ch, CURLOPT_POSTFIELDS, $nvpreq);

 // Get response from the server.
 $httpResponse = curl_exec($ch);

 if(!$httpResponse) {
 exit("$methodName_ failed: ".curl_error($ch).'('.curl_errno($ch).')');
 }

 // Extract the response details.
 $httpResponseAr = explode("&", $httpResponse);

 $httpParsedResponseAr = array();
 foreach ($httpResponseAr as $i => $value) {
 $tmpAr = explode("=", $value);
 if(sizeof($tmpAr) > 1) {
 $httpParsedResponseAr[$tmpAr[0]] = $tmpAr[1];
 }
 }

 if((0 == sizeof($httpParsedResponseAr)) || !array_key_exists('ACK', $httpParsedResponseAr)) {
 exit("Invalid HTTP Response for POST request($nvpreq) to $API_Endpoint.");
 }

 return $httpParsedResponseAr;
}

// Set request-specific fields.
$transactionID = urlencode('example_transaction_id');
$refundType = urlencode('Full');  // or 'Partial'
$amount;                          // required if Partial.
$memo;                            // required if Partial.
$currencyID = urlencode('USD');   // or other currency ('GBP', 'EUR', 'JPY', 'CAD', 'AUD')

// Add request-specific fields to the request string.
$nvpStr = "&TRANSACTIONID=$transactionID&REFUNDTYPE=$refundType&CURRENCYCODE=$currencyID";

if(isset($memo)) {
 $nvpStr .= "&NOTE=$memo";
}

if(strcasecmp($refundType, 'Partial') == 0) {
 if(!isset($amount)) {
 exit('Partial Refund Amount is not specified.');
 } else {
 $nvpStr = $nvpStr."&AMT=$amount";
 }

 if(!isset($memo)) {
 exit('Partial Refund Memo is not specified.');
 }
}

// Execute the API operation; see the PPHttpPost function above.
$httpParsedResponseAr = PPHttpPost('RefundTransaction', $nvpStr);

if("SUCCESS" == strtoupper($httpParsedResponseAr["ACK"]) ||
   "SUCCESSWITHWARNING" == strtoupper($httpParsedResponseAr["ACK"])) {
 exit('Refund Completed Successfully: '.print_r($httpParsedResponseAr, true));
} else  {
 exit('RefundTransaction failed: ' . print_r($httpParsedResponseAr, true));
}
?>

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