You can visit PayWay rest api documentation page:
https://www.payway.com.au/docs/rest.html#refund-a-paymentPayWay Rest API: Check if Rest API credentials are valid
PayWay Rest API: Create Customer Create Token
<?php include_once "CurlExecutor.php"; define("BASE_URL", "https://api.payway.com.au/rest/v1"); define("MERCHANT_ID", "TEST"); define("PRIVATE_KEY", "T10487_SEC_..."); define("PUBLIC_KEY", "T10487_PUB_..."); createRefundOfPayment(); function createRefundOfPayment() { $headers[] = "Authorization: Basic " . base64_encode(PRIVATE_KEY . ":"); $headers[] = "Content-Type: application/x-www-form-urlencoded"; $post = array( "parentTransactionId" => "1956258559", "transactionType" => "refund", "principalAmount" => "23.45", "orderNumber" => "RefundIdentification" ); $result = CurlExecutor::execute(BASE_URL . "/transactions", "POST", $post, null, $headers); $result["response"] = json_decode($result["response"]); CurlExecutor::prettyPrint($result); } ?>
And output is below:
Array ( [code] => 201 [response] => stdClass Object ( [transactionId] => 1958000143 [receiptNumber] => 1958000143 [status] => approved [responseCode] => 08 [responseText] => Honour with identification [transactionType] => refund [customerNumber] => 5 [customerName] => Hexa Lucio [customerEmail] => hexa@bitmascot.com [orderNumber] => RefundIdentification [currency] => aud [principalAmount] => -23.45 [surchargeAmount] => 0 [paymentAmount] => -23.45 [paymentMethod] => creditCard [creditCard] => stdClass Object ( [cardNumber] => 456471...004 [expiryDateMonth] => 02 [expiryDateYear] => 19 [cardScheme] => visa [cardholderName] => Hexa Lucio Tony ) [merchant] => stdClass Object ( [merchantId] => TEST [merchantName] => Test Merchant [links] => Array ( [0] => stdClass Object ( [rel] => self [href] => https://api.payway.com.au/rest/v1/merchants/TEST ) ) ) [transactionDateTime] => 10 Jun 2017 13:24 AEST [settlementDate] => 10 Jun 2017 [parentTransaction] => stdClass Object ( [transactionId] => 1956258559 [receiptNumber] => 1956258559 [status] => approved [transactionType] => payment [customerNumber] => 5 [orderNumber] => INV-GGO-ABA-460 [currency] => aud [paymentAmount] => 99.25 [settlementDate] => 08 Jun 2017 ) [isVoidable] => 1 [isRefundable] => [links] => Array ( [0] => stdClass Object ( [rel] => self [href] => https://api.payway.com.au/rest/v1/transactions/1958000143 ) [1] => stdClass Object ( [rel] => void [href] => https://api.payway.com.au/transactions/1958000143/void ) [2] => stdClass Object ( [rel] => parent [href] => https://api.payway.com.au/rest/v1/transactions/1956258559 ) ) ) )