curl --request POST \
  --url https://server.twicecommerce.com/v1/admin/transactions/{transactionId}/refund \
  --header 'Content-Type: application/json' \
  --header 'X-API-KEY: <api-key>' \
  --data '
{
  "amount": 123,
  "idempotencyKey": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
}
'

import requests

url = "https://server.twicecommerce.com/v1/admin/transactions/{transactionId}/refund"

payload = {
    "amount": 123,
    "idempotencyKey": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
}
headers = {
    "X-API-KEY": "<api-key>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {'X-API-KEY': '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({amount: 123, idempotencyKey: '3c90c3cc-0d44-4b50-8888-8dd25736052a'})
};

fetch('https://server.twicecommerce.com/v1/admin/transactions/{transactionId}/refund', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://server.twicecommerce.com/v1/admin/transactions/{transactionId}/refund",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'amount' => 123,
    'idempotencyKey' => '3c90c3cc-0d44-4b50-8888-8dd25736052a'
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "X-API-KEY: <api-key>"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://server.twicecommerce.com/v1/admin/transactions/{transactionId}/refund"

	payload := strings.NewReader("{\n  \"amount\": 123,\n  \"idempotencyKey\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\"\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("X-API-KEY", "<api-key>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://server.twicecommerce.com/v1/admin/transactions/{transactionId}/refund")
  .header("X-API-KEY", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"amount\": 123,\n  \"idempotencyKey\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://server.twicecommerce.com/v1/admin/transactions/{transactionId}/refund")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["X-API-KEY"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"amount\": 123,\n  \"idempotencyKey\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\"\n}"

response = http.request(request)
puts response.read_body

{
  "refundPayment": {
    "id": "<string>",
    "type": "sale",
    "status": "pending",
    "pricing": {
      "currency": "<string>",
      "total": 0,
      "subtotal": 0,
      "totalTaxes": 0,
      "totalDiscounts": 0,
      "taxExcluded": true,
      "taxLines": [
        {
          "price": 0,
          "rate": 123,
          "combinedLabel": {
            "def": "<string>"
          },
          "label": {
            "def": "<string>"
          },
          "taxableAmount": 0
        }
      ],
      "listPrice": 0,
      "originalListPrice": 0,
      "additionalInfo": "<string>",
      "discountCodes": {},
      "manualDiscount": 0,
      "deposit": 0
    },
    "receiptNumber": 123,
    "issuedAt": "<string>",
    "lines": {
      "id": "<string>",
      "paymentId": "<string>",
      "type": "line_item",
      "name": "<string>",
      "quantity": 123,
      "pricing": {
        "currency": "<string>",
        "total": 0,
        "subtotal": 0,
        "totalTaxes": 0,
        "totalDiscounts": 0,
        "taxExcluded": true,
        "taxLines": [
          {
            "price": 0,
            "rate": 123,
            "combinedLabel": {
              "def": "<string>"
            },
            "label": {
              "def": "<string>"
            },
            "taxableAmount": 0
          }
        ],
        "listPrice": 0,
        "originalListPrice": 0,
        "additionalInfo": "<string>",
        "discountCodes": {},
        "manualDiscount": 0,
        "deposit": 0
      },
      "createdAt": "<string>",
      "updatedAt": "<string>",
      "modificationSummary": {
        "refundedTotal": 123,
        "refundReversedTotal": 123,
        "cancelledTotal": 123,
        "expiredTotal": 123,
        "capturedTotal": 123,
        "isFullyRefunded": true,
        "isPartiallyRefunded": true,
        "pendingRefundsTotal": 123,
        "pendingCapturesTotal": 123,
        "isCancelled": true,
        "isReversed": true,
        "isExpired": true
      },
      "orderLineItemId": "<string>",
      "invoiceId": "<string>",
      "invoiceLineId": "<string>",
      "meta": "<unknown>"
    },
    "transactions": {
      "id": "<string>",
      "paymentId": "<string>",
      "type": "authorize",
      "status": "pending",
      "method": "<string>",
      "provider": "<string>",
      "currency": "<string>",
      "total": 123,
      "occurredAt": "<string>",
      "modificationSummary": {
        "refundedTotal": 123,
        "refundReversedTotal": 123,
        "cancelledTotal": 123,
        "expiredTotal": 123,
        "capturedTotal": 123,
        "isFullyRefunded": true,
        "isPartiallyRefunded": true,
        "pendingRefundsTotal": 123,
        "pendingCapturesTotal": 123,
        "isCancelled": true,
        "isReversed": true,
        "isExpired": true
      },
      "createdAt": "<string>",
      "updatedAt": "<string>",
      "originalTransactionId": "<string>",
      "customMethodId": "<string>",
      "providerReferenceId": "<string>",
      "providerResponse": "<unknown>",
      "cardBrand": "<string>",
      "cardLast4": "<string>",
      "meta": "<unknown>"
    },
    "modificationSummary": {
      "refundedTotal": 123,
      "refundReversedTotal": 123,
      "cancelledTotal": 123,
      "expiredTotal": 123,
      "capturedTotal": 123,
      "isFullyRefunded": true,
      "isPartiallyRefunded": true,
      "pendingRefundsTotal": 123,
      "pendingCapturesTotal": 123,
      "isCancelled": true,
      "isReversed": true,
      "isExpired": true
    },
    "createdAt": "<string>",
    "updatedAt": "<string>",
    "orderId": "<string>",
    "originalPaymentId": "<string>",
    "meta": "<unknown>",
    "tenantInfo": {
      "name": "<string>",
      "legalName": "<string>",
      "businessId": "<string>",
      "address": "<string>",
      "phone": "<string>"
    }
  },
  "originalPayment": {
    "id": "<string>",
    "type": "sale",
    "status": "pending",
    "pricing": {
      "currency": "<string>",
      "total": 0,
      "subtotal": 0,
      "totalTaxes": 0,
      "totalDiscounts": 0,
      "taxExcluded": true,
      "taxLines": [
        {
          "price": 0,
          "rate": 123,
          "combinedLabel": {
            "def": "<string>"
          },
          "label": {
            "def": "<string>"
          },
          "taxableAmount": 0
        }
      ],
      "listPrice": 0,
      "originalListPrice": 0,
      "additionalInfo": "<string>",
      "discountCodes": {},
      "manualDiscount": 0,
      "deposit": 0
    },
    "receiptNumber": 123,
    "issuedAt": "<string>",
    "lines": {
      "id": "<string>",
      "paymentId": "<string>",
      "type": "line_item",
      "name": "<string>",
      "quantity": 123,
      "pricing": {
        "currency": "<string>",
        "total": 0,
        "subtotal": 0,
        "totalTaxes": 0,
        "totalDiscounts": 0,
        "taxExcluded": true,
        "taxLines": [
          {
            "price": 0,
            "rate": 123,
            "combinedLabel": {
              "def": "<string>"
            },
            "label": {
              "def": "<string>"
            },
            "taxableAmount": 0
          }
        ],
        "listPrice": 0,
        "originalListPrice": 0,
        "additionalInfo": "<string>",
        "discountCodes": {},
        "manualDiscount": 0,
        "deposit": 0
      },
      "createdAt": "<string>",
      "updatedAt": "<string>",
      "modificationSummary": {
        "refundedTotal": 123,
        "refundReversedTotal": 123,
        "cancelledTotal": 123,
        "expiredTotal": 123,
        "capturedTotal": 123,
        "isFullyRefunded": true,
        "isPartiallyRefunded": true,
        "pendingRefundsTotal": 123,
        "pendingCapturesTotal": 123,
        "isCancelled": true,
        "isReversed": true,
        "isExpired": true
      },
      "orderLineItemId": "<string>",
      "invoiceId": "<string>",
      "invoiceLineId": "<string>",
      "meta": "<unknown>"
    },
    "transactions": {
      "id": "<string>",
      "paymentId": "<string>",
      "type": "authorize",
      "status": "pending",
      "method": "<string>",
      "provider": "<string>",
      "currency": "<string>",
      "total": 123,
      "occurredAt": "<string>",
      "modificationSummary": {
        "refundedTotal": 123,
        "refundReversedTotal": 123,
        "cancelledTotal": 123,
        "expiredTotal": 123,
        "capturedTotal": 123,
        "isFullyRefunded": true,
        "isPartiallyRefunded": true,
        "pendingRefundsTotal": 123,
        "pendingCapturesTotal": 123,
        "isCancelled": true,
        "isReversed": true,
        "isExpired": true
      },
      "createdAt": "<string>",
      "updatedAt": "<string>",
      "originalTransactionId": "<string>",
      "customMethodId": "<string>",
      "providerReferenceId": "<string>",
      "providerResponse": "<unknown>",
      "cardBrand": "<string>",
      "cardLast4": "<string>",
      "meta": "<unknown>"
    },
    "modificationSummary": {
      "refundedTotal": 123,
      "refundReversedTotal": 123,
      "cancelledTotal": 123,
      "expiredTotal": 123,
      "capturedTotal": 123,
      "isFullyRefunded": true,
      "isPartiallyRefunded": true,
      "pendingRefundsTotal": 123,
      "pendingCapturesTotal": 123,
      "isCancelled": true,
      "isReversed": true,
      "isExpired": true
    },
    "createdAt": "<string>",
    "updatedAt": "<string>",
    "orderId": "<string>",
    "originalPaymentId": "<string>",
    "meta": "<unknown>",
    "tenantInfo": {
      "name": "<string>",
      "legalName": "<string>",
      "businessId": "<string>",
      "address": "<string>",
      "phone": "<string>"
    }
  },
  "refundedAmount": 123,
  "totalRefundedForTransaction": 123,
  "transactionFullyRefunded": true
}