curl --request POST \
  --url https://api-sb.meld.io/payments/external/refund \
  --header 'Authorization: <api-key>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "serviceProvider": "AUTHORIZENET",
  "sourceAmount": 0
}
'

import requests

url = "https://api-sb.meld.io/payments/external/refund"

payload = {
    "serviceProvider": "AUTHORIZENET",
    "sourceAmount": 0
}
headers = {
    "Authorization": "<api-key>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {Authorization: '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({serviceProvider: 'AUTHORIZENET', sourceAmount: 0})
};

fetch('https://api-sb.meld.io/payments/external/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://api-sb.meld.io/payments/external/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([
    'serviceProvider' => 'AUTHORIZENET',
    'sourceAmount' => 0
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: <api-key>",
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($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://api-sb.meld.io/payments/external/refund"

	payload := strings.NewReader("{\n  \"serviceProvider\": \"AUTHORIZENET\",\n  \"sourceAmount\": 0\n}")

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

	req.Header.Add("Authorization", "<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://api-sb.meld.io/payments/external/refund")
  .header("Authorization", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"serviceProvider\": \"AUTHORIZENET\",\n  \"sourceAmount\": 0\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api-sb.meld.io/payments/external/refund")

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

request = Net::HTTP::Post.new(url)
request["Authorization"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"serviceProvider\": \"AUTHORIZENET\",\n  \"sourceAmount\": 0\n}"

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

{
  "transaction": {
    "createdAt": "2023-11-07T05:31:56Z",
    "id": "<string>",
    "serviceProvider": "<string>",
    "sessionId": "<string>",
    "status": "<string>",
    "transactionType": "<string>",
    "updatedAt": "2023-11-07T05:31:56Z",
    "accountId": "<string>",
    "countryCode": "<string>",
    "cryptoDetails": {
      "blockchainTransactionId": "<string>",
      "chainId": "<string>",
      "institution": "<string>",
      "networkFee": 123,
      "networkFeeInUsd": 123,
      "offrampDestinationWalletAddress": "<string>",
      "partnerFee": 123,
      "partnerFeeInUsd": 123,
      "swapFee": 123,
      "swapFeeInUsd": 123,
      "totalFee": 123,
      "totalFeeInUsd": 123,
      "transactionFee": 123,
      "transactionFeeInUsd": 123,
      "walletAddress": "<string>"
    },
    "customer": {
      "accountId": "<string>",
      "addresses": [
        {
          "addressDetails": {
            "city": "<string>",
            "country": "<string>",
            "firstName": "<string>",
            "lastName": "<string>",
            "lineOne": "<string>",
            "lineTwo": "<string>",
            "postalCode": "<string>",
            "region": "<string>"
          }
        }
      ],
      "email": "<string>",
      "externalId": "<string>",
      "id": "<string>",
      "name": {
        "firstName": "<string>",
        "lastName": "<string>"
      },
      "phone": "<string>",
      "serviceProviders": {},
      "status": "<string>"
    },
    "description": "<string>",
    "destinationAmount": 123,
    "destinationCurrencyCode": "<string>",
    "externalCustomerId": "<string>",
    "externalReferenceId": "<string>",
    "externalSessionId": "<string>",
    "externalSubaccountCustomerId": "<string>",
    "fiatAmountInUsd": 123,
    "isImported": true,
    "isPassthrough": true,
    "key": "<string>",
    "multiFactorAuthorizationStatus": [
      {
        "submitted": true,
        "successful": true,
        "url": "<string>"
      }
    ],
    "orderId": "<string>",
    "parentPaymentTransactionId": "<string>",
    "passthroughReference": "<string>",
    "paymentDetails": {
      "authAmount": 123,
      "captureAmount": 123
    },
    "paymentMethodType": "<string>",
    "serviceProviderCreatedAt": "2023-11-07T05:31:56Z",
    "serviceProviderDetails": {},
    "serviceProviderTransactionUrl": "<string>",
    "serviceTransactionId": "<string>",
    "sessionClientTags": {},
    "sourceAmount": 123,
    "sourceCurrencyCode": "<string>",
    "subaccountCustomerId": "<string>"
  }
}

{
  "transaction": {
    "createdAt": "2023-11-07T05:31:56Z",
    "id": "<string>",
    "serviceProvider": "<string>",
    "sessionId": "<string>",
    "status": "<string>",
    "transactionType": "<string>",
    "updatedAt": "2023-11-07T05:31:56Z",
    "accountId": "<string>",
    "countryCode": "<string>",
    "cryptoDetails": {
      "blockchainTransactionId": "<string>",
      "chainId": "<string>",
      "institution": "<string>",
      "networkFee": 123,
      "networkFeeInUsd": 123,
      "offrampDestinationWalletAddress": "<string>",
      "partnerFee": 123,
      "partnerFeeInUsd": 123,
      "swapFee": 123,
      "swapFeeInUsd": 123,
      "totalFee": 123,
      "totalFeeInUsd": 123,
      "transactionFee": 123,
      "transactionFeeInUsd": 123,
      "walletAddress": "<string>"
    },
    "customer": {
      "accountId": "<string>",
      "addresses": [
        {
          "addressDetails": {
            "city": "<string>",
            "country": "<string>",
            "firstName": "<string>",
            "lastName": "<string>",
            "lineOne": "<string>",
            "lineTwo": "<string>",
            "postalCode": "<string>",
            "region": "<string>"
          }
        }
      ],
      "email": "<string>",
      "externalId": "<string>",
      "id": "<string>",
      "name": {
        "firstName": "<string>",
        "lastName": "<string>"
      },
      "phone": "<string>",
      "serviceProviders": {},
      "status": "<string>"
    },
    "description": "<string>",
    "destinationAmount": 123,
    "destinationCurrencyCode": "<string>",
    "externalCustomerId": "<string>",
    "externalReferenceId": "<string>",
    "externalSessionId": "<string>",
    "externalSubaccountCustomerId": "<string>",
    "fiatAmountInUsd": 123,
    "isImported": true,
    "isPassthrough": true,
    "key": "<string>",
    "multiFactorAuthorizationStatus": [
      {
        "submitted": true,
        "successful": true,
        "url": "<string>"
      }
    ],
    "orderId": "<string>",
    "parentPaymentTransactionId": "<string>",
    "passthroughReference": "<string>",
    "paymentDetails": {
      "authAmount": 123,
      "captureAmount": 123
    },
    "paymentMethodType": "<string>",
    "serviceProviderCreatedAt": "2023-11-07T05:31:56Z",
    "serviceProviderDetails": {},
    "serviceProviderTransactionUrl": "<string>",
    "serviceTransactionId": "<string>",
    "sessionClientTags": {},
    "sourceAmount": 123,
    "sourceCurrencyCode": "<string>",
    "subaccountCustomerId": "<string>"
  }
}

{
  "code": "<string>",
  "displayMessage": "<string>",
  "errors": [
    "<string>"
  ],
  "message": "<string>",
  "requestId": "<string>",
  "serviceProviderDetails": {},
  "timestamp": "2023-11-07T05:31:56Z"
}