> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://docs.api.corpx.com/ib/referencia/pix-med/message-pix-med/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://docs.api.corpx.com/_mcp/server.

# Reply to a clarification request

POST https://client.api.corpx.com/v1/accounts/{accountId}/pix/med/{id}/messages
Content-Type: application/json

The account holder's reply to the review's question. Only accepted in `info_requested`; otherwise `409 med_not_writable`. Attachments that explain the message go through `evidence/add` with the returned `messageId`. Close the package with `POST .../submit`.

Reference: https://docs.api.corpx.com/ib/referencia/pix-med/message-pix-med

## Authentication

- `Authorization` header (bearer token, required) — Bearer authentication of the form `Bearer <token>`, where token is your auth token.

## Request

### Path parameters

- `accountId` (string, required) — Account identifier.
- `id` (string, required) — The `medId`.

### Headers

- `X-Tenant-Id` (string, required) — Tenant context used for authorization and routing.
- `Idempotency-Key` (string, optional) — Optional client-generated idempotency token (recommended for safe retries).
- `X-Request-Timestamp` (string, required) — Unix seconds. Required on the signed host; tolerance is 300s either way (`403 request_timestamp_skew`).
- `X-Content-SHA256` (string, required) — Lowercase hex SHA-256 of the body. An empty body hashes the empty string, so the header is always present. Mismatch returns `400 body_hash_mismatch`.
- `X-Request-Signature` (string, required) — Detached JWS (`<protected>..<signature>`, ES256 or PS256) over `METHOD\nPATH?QUERY\nTIMESTAMP\nIDEMPOTENCY_KEY_OR_EMPTY\nX_CONTENT_SHA256`.

### Body (application/json)

This endpoint expects a PixMedMessageRequest.

- `body` (string, required) — The account holder's reply, free text.

## Response

### 201

Message recorded.

- `medId` (string, required)
- `messageId` (string, required)
- `authorKind` (enum, required)
  - Allowed values: `holder`
- `body` (string, required)
- `createdAt` (datetime, required)

## Errors

### 400 Bad Request Error

Invalid request sent by client.

- `errorCode` (string, required) — Stable machine-readable code. See `ErrorCode` for the known values.
- `message` (string, required) — Human-readable explanation (pt-BR). Presentation only; may change.
- `docs` (string, optional) — Link to this code in the public error catalogue.
- `requestId` (string, optional) — Gateway request id. Quote it when contacting support.
- `details` (map from string to any, optional) — Optional machine-readable context for the specific `errorCode` (for example `kind` on `identity_verification_monthly_limit_exceeded`, `maxBytes` on `payload_too_large`, `attemptsRemaining` on `facetec_attempts_exhausted`). Keys are documented per operation; absent when the code carries no extra context.
- `partner` (ErrorResponsePartner, optional) — Raw error from the settlement bank, when the failure came from it. Diagnostic only.

### 404 Not Found Error

Dispute not found, or not on this account (`med_not_found`).

- `errorCode` (string, required) — Stable machine-readable code. See `ErrorCode` for the known values.
- `message` (string, required) — Human-readable explanation (pt-BR). Presentation only; may change.
- `docs` (string, optional) — Link to this code in the public error catalogue.
- `requestId` (string, optional) — Gateway request id. Quote it when contacting support.
- `details` (map from string to any, optional) — Optional machine-readable context for the specific `errorCode` (for example `kind` on `identity_verification_monthly_limit_exceeded`, `maxBytes` on `payload_too_large`, `attemptsRemaining` on `facetec_attempts_exhausted`). Keys are documented per operation; absent when the code carries no extra context.
- `partner` (ErrorResponsePartner, optional) — Raw error from the settlement bank, when the failure came from it. Diagnostic only.

### 409 Conflict Error

Dispute not in `info_requested` (`med_not_writable`).

- `errorCode` (string, required) — Stable machine-readable code. See `ErrorCode` for the known values.
- `message` (string, required) — Human-readable explanation (pt-BR). Presentation only; may change.
- `docs` (string, optional) — Link to this code in the public error catalogue.
- `requestId` (string, optional) — Gateway request id. Quote it when contacting support.
- `details` (map from string to any, optional) — Optional machine-readable context for the specific `errorCode` (for example `kind` on `identity_verification_monthly_limit_exceeded`, `maxBytes` on `payload_too_large`, `attemptsRemaining` on `facetec_attempts_exhausted`). Keys are documented per operation; absent when the code carries no extra context.
- `partner` (ErrorResponsePartner, optional) — Raw error from the settlement bank, when the failure came from it. Diagnostic only.

### 422 Unprocessable Entity Error

`invalid_payload` — empty `body` or above 2000 characters.

- `errorCode` (string, required) — Stable machine-readable code. See `ErrorCode` for the known values.
- `message` (string, required) — Human-readable explanation (pt-BR). Presentation only; may change.
- `docs` (string, optional) — Link to this code in the public error catalogue.
- `requestId` (string, optional) — Gateway request id. Quote it when contacting support.
- `details` (map from string to any, optional) — Optional machine-readable context for the specific `errorCode` (for example `kind` on `identity_verification_monthly_limit_exceeded`, `maxBytes` on `payload_too_large`, `attemptsRemaining` on `facetec_attempts_exhausted`). Keys are documented per operation; absent when the code carries no extra context.
- `partner` (ErrorResponsePartner, optional) — Raw error from the settlement bank, when the failure came from it. Diagnostic only.

### 500 Internal Server Error

Unexpected server error.

- `errorCode` (string, required) — Stable machine-readable code. See `ErrorCode` for the known values.
- `message` (string, required) — Human-readable explanation (pt-BR). Presentation only; may change.
- `docs` (string, optional) — Link to this code in the public error catalogue.
- `requestId` (string, optional) — Gateway request id. Quote it when contacting support.
- `details` (map from string to any, optional) — Optional machine-readable context for the specific `errorCode` (for example `kind` on `identity_verification_monthly_limit_exceeded`, `maxBytes` on `payload_too_large`, `attemptsRemaining` on `facetec_attempts_exhausted`). Keys are documented per operation; absent when the code carries no extra context.
- `partner` (ErrorResponsePartner, optional) — Raw error from the settlement bank, when the failure came from it. Diagnostic only.

## Types

### ErrorResponsePartner

Raw error from the settlement bank, when the failure came from it. Diagnostic only.

- `code` (string, optional)
- `message` (string, optional)
- `field` (string, optional) — Field the partner pointed at, when any.

## Examples

**Request**

```json
{
  "body": "Segue o comprovante de entrega com rastreio BR123456789BR."
}
```

**Response**

```json
{
  "medId": "204cc938-da3d-4f04-baf3-0b2e6a2f1283",
  "messageId": "medmsg_01J9Y",
  "authorKind": "holder",
  "body": "Segue o comprovante de entrega com rastreio BR123456789BR.",
  "createdAt": "2026-02-20T16:40:00Z"
}
```

**SDK Code**

```python Pix MED_messagePixMed_example
import requests

url = "https://client.api.corpx.com/v1/accounts/accountId/pix/med/id/messages"

payload = { "body": "Segue o comprovante de entrega com rastreio BR123456789BR." }
headers = {
    "X-Content-SHA256": "X-Content-SHA256",
    "X-Request-Signature": "X-Request-Signature",
    "X-Request-Timestamp": "X-Request-Timestamp",
    "X-Tenant-Id": "X-Tenant-Id",
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.json())
```

```javascript Pix MED_messagePixMed_example
const url = 'https://client.api.corpx.com/v1/accounts/accountId/pix/med/id/messages';
const options = {
  method: 'POST',
  headers: {
    'X-Content-SHA256': 'X-Content-SHA256',
    'X-Request-Signature': 'X-Request-Signature',
    'X-Request-Timestamp': 'X-Request-Timestamp',
    'X-Tenant-Id': 'X-Tenant-Id',
    Authorization: 'Bearer <token>',
    'Content-Type': 'application/json'
  },
  body: '{"body":"Segue o comprovante de entrega com rastreio BR123456789BR."}'
};

try {
  const response = await fetch(url, options);
  const data = await response.json();
  console.log(data);
} catch (error) {
  console.error(error);
}
```

```go Pix MED_messagePixMed_example
package main

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

func main() {

	url := "https://client.api.corpx.com/v1/accounts/accountId/pix/med/id/messages"

	payload := strings.NewReader("{\n  \"body\": \"Segue o comprovante de entrega com rastreio BR123456789BR.\"\n}")

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

	req.Header.Add("X-Content-SHA256", "X-Content-SHA256")
	req.Header.Add("X-Request-Signature", "X-Request-Signature")
	req.Header.Add("X-Request-Timestamp", "X-Request-Timestamp")
	req.Header.Add("X-Tenant-Id", "X-Tenant-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(res)
	fmt.Println(string(body))

}
```

```ruby Pix MED_messagePixMed_example
require 'uri'
require 'net/http'

url = URI("https://client.api.corpx.com/v1/accounts/accountId/pix/med/id/messages")

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

request = Net::HTTP::Post.new(url)
request["X-Content-SHA256"] = 'X-Content-SHA256'
request["X-Request-Signature"] = 'X-Request-Signature'
request["X-Request-Timestamp"] = 'X-Request-Timestamp'
request["X-Tenant-Id"] = 'X-Tenant-Id'
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"body\": \"Segue o comprovante de entrega com rastreio BR123456789BR.\"\n}"

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

```java Pix MED_messagePixMed_example
import com.mashape.unirest.http.HttpResponse;
import com.mashape.unirest.http.Unirest;

HttpResponse<String> response = Unirest.post("https://client.api.corpx.com/v1/accounts/accountId/pix/med/id/messages")
  .header("X-Content-SHA256", "X-Content-SHA256")
  .header("X-Request-Signature", "X-Request-Signature")
  .header("X-Request-Timestamp", "X-Request-Timestamp")
  .header("X-Tenant-Id", "X-Tenant-Id")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"body\": \"Segue o comprovante de entrega com rastreio BR123456789BR.\"\n}")
  .asString();
```

```php Pix MED_messagePixMed_example
<?php
require_once('vendor/autoload.php');

$client = new \GuzzleHttp\Client();

$response = $client->request('POST', 'https://client.api.corpx.com/v1/accounts/accountId/pix/med/id/messages', [
  'body' => '{
  "body": "Segue o comprovante de entrega com rastreio BR123456789BR."
}',
  'headers' => [
    'Authorization' => 'Bearer <token>',
    'Content-Type' => 'application/json',
    'X-Content-SHA256' => 'X-Content-SHA256',
    'X-Request-Signature' => 'X-Request-Signature',
    'X-Request-Timestamp' => 'X-Request-Timestamp',
    'X-Tenant-Id' => 'X-Tenant-Id',
  ],
]);

echo $response->getBody();
```

```csharp Pix MED_messagePixMed_example
using RestSharp;

var client = new RestClient("https://client.api.corpx.com/v1/accounts/accountId/pix/med/id/messages");
var request = new RestRequest(Method.POST);
request.AddHeader("X-Content-SHA256", "X-Content-SHA256");
request.AddHeader("X-Request-Signature", "X-Request-Signature");
request.AddHeader("X-Request-Timestamp", "X-Request-Timestamp");
request.AddHeader("X-Tenant-Id", "X-Tenant-Id");
request.AddHeader("Authorization", "Bearer <token>");
request.AddHeader("Content-Type", "application/json");
request.AddParameter("application/json", "{\n  \"body\": \"Segue o comprovante de entrega com rastreio BR123456789BR.\"\n}", ParameterType.RequestBody);
IRestResponse response = client.Execute(request);
```

```swift Pix MED_messagePixMed_example
import Foundation

let headers = [
  "X-Content-SHA256": "X-Content-SHA256",
  "X-Request-Signature": "X-Request-Signature",
  "X-Request-Timestamp": "X-Request-Timestamp",
  "X-Tenant-Id": "X-Tenant-Id",
  "Authorization": "Bearer <token>",
  "Content-Type": "application/json"
]
let parameters = ["body": "Segue o comprovante de entrega com rastreio BR123456789BR."] as [String : Any]

let postData = JSONSerialization.data(withJSONObject: parameters, options: [])

let request = NSMutableURLRequest(url: NSURL(string: "https://client.api.corpx.com/v1/accounts/accountId/pix/med/id/messages")! as URL,
                                        cachePolicy: .useProtocolCachePolicy,
                                    timeoutInterval: 10.0)
request.httpMethod = "POST"
request.allHTTPHeaderFields = headers
request.httpBody = postData as Data

let session = URLSession.shared
let dataTask = session.dataTask(with: request as URLRequest, completionHandler: { (data, response, error) -> Void in
  if (error != nil) {
    print(error as Any)
  } else {
    let httpResponse = response as? HTTPURLResponse
    print(httpResponse)
  }
})

dataTask.resume()
```