curl --request POST \
  --url https://api.example.com/spi/v1/transfers/01960718-a213-2435-6078-901234567123/refunds \
  --header 'Authorization: Bearer demo-access-token' \
  --header 'Content-Type: application/json' \
  --header 'Idempotency-Key: pix-demo-20260903-000001' \
  --header 'X-Account-Id: 019606a1-3b4c-7d8e-9f01-234567890abc' \
  --data '{
  "amount": "100.00",
  "reason": "Estorno solicitado pelo pagador",
  "reasonCode": "MD06"
}'

import requests

url = "https://api.example.com/spi/v1/transfers/{id}/refunds"

payload = {
    "amount": "100.00",
    "reason": "Estorno solicitado pelo pagador",
    "reasonCode": "MD06"
}
headers = {
    "Idempotency-Key": "<idempotency-key>",
    "X-Account-Id": "<x-account-id>",
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {
    'Idempotency-Key': '<idempotency-key>',
    'X-Account-Id': '<x-account-id>',
    Authorization: 'Bearer <token>',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    amount: '100.00',
    reason: 'Estorno solicitado pelo pagador',
    reasonCode: 'MD06'
  })
};

fetch('https://api.example.com/spi/v1/transfers/{id}/refunds', 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.example.com/spi/v1/transfers/{id}/refunds",
  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' => '100.00',
    'reason' => 'Estorno solicitado pelo pagador',
    'reasonCode' => 'MD06'
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: application/json",
    "Idempotency-Key: <idempotency-key>",
    "X-Account-Id: <x-account-id>"
  ],
]);

$response = curl_exec($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.example.com/spi/v1/transfers/{id}/refunds"

	payload := strings.NewReader("{\n  \"amount\": \"100.00\",\n  \"reason\": \"Estorno solicitado pelo pagador\",\n  \"reasonCode\": \"MD06\"\n}")

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

	req.Header.Add("Idempotency-Key", "<idempotency-key>")
	req.Header.Add("X-Account-Id", "<x-account-id>")
	req.Header.Add("Authorization", "Bearer <token>")
	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.example.com/spi/v1/transfers/{id}/refunds")
  .header("Idempotency-Key", "<idempotency-key>")
  .header("X-Account-Id", "<x-account-id>")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"amount\": \"100.00\",\n  \"reason\": \"Estorno solicitado pelo pagador\",\n  \"reasonCode\": \"MD06\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.example.com/spi/v1/transfers/{id}/refunds")

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

request = Net::HTTP::Post.new(url)
request["Idempotency-Key"] = '<idempotency-key>'
request["X-Account-Id"] = '<x-account-id>'
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"amount\": \"100.00\",\n  \"reason\": \"Estorno solicitado pelo pagador\",\n  \"reasonCode\": \"MD06\"\n}"

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

{
  "accountId": "019606a0-1a2b-7c3d-8e4f-567890123abc",
  "amount": "100.00",
  "createdAt": "2026-05-06T10:45:00Z",
  "description": "Estorno solicitado pelo pagador",
  "id": "019606b1-3b4c-7d8e-9f01-234567890dee",
  "ledger": {
    "destinationOperationId": "019606a5-7f80-7182-3c4d-56789012cdf1",
    "revert": {
      "destinationOperationId": "019606a5-7f80-7182-3c4d-56789012cdf1",
      "sourceOperationId": "019606a5-7f80-7182-3c4d-56789012cdf0",
      "transactionId": "019606a5-7f80-7182-3c4d-56789012cdef"
    },
    "sourceOperationId": "019606a5-7f80-7182-3c4d-56789012cdf0",
    "transactionId": "019606a5-7f80-7182-3c4d-56789012cdef"
  },
  "metadata": {
    "field": "field-example"
  },
  "originalEndToEndId": "E12345678202605061030abcdef12345",
  "reasonCode": "MD06",
  "returnEndToEndId": "D12345678202605061045fedcba54321",
  "status": "COMPLETED",
  "type": "OUTBOUND",
  "updatedAt": "2026-05-06T10:45:30Z"
}

{
  "code": "PIX-0030",
  "title": "Idempotency Key Required",
  "message": "O cabeçalho Idempotency-Key é obrigatório nesta operação e deve respeitar o tamanho aceito."
}

{
  "code": "PIX-0031",
  "title": "Idempotency Key Conflict",
  "message": "A Idempotency-Key já foi usada com uma requisição diferente."
}

{
  "code": "PIX-0032",
  "title": "Idempotency Unavailable",
  "message": "A requisição não foi processada porque o armazenamento de idempotência está indisponível. Tente novamente."
}

{
  "code": "ERR-0001",
  "detail": "Property foo is required but is missing.",
  "errors": [
    {
      "location": "<string>",
      "message": "<string>",
      "value": "<unknown>"
    }
  ],
  "instance": "https://example.com/error-log/abc123",
  "status": 400,
  "title": "Bad Request",
  "type": "https://example.com/errors/example",
  "upstream": {
    "code": "E4001",
    "message": "account not found at provider"
  }
}