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curl --request POST https://sandbox.example/v1/consignments \
  --cert client.crt --key client.key \
  --header "Authorization: Bearer ${TOKEN}" \
  --header "Idempotency-Key: 04df..." \
  --header "Content-Type: application/json" \
  --data '{"recipient":{"type":"legal_entity","id":"DEMO-001"},"contentHash":"sha256:...","callbackUrl":"https://client.example/webhooks/delivery"}' 

// Java 21 example: validate input, use idempotency and handle retryable failures.
HttpRequest request = HttpRequest.newBuilder(endpoint)
    .header("Authorization", "Bearer " + token)
    .header("Idempotency-Key", idempotencyKey)
    .header("Content-Type", "application/json")
    .POST(HttpRequest.BodyPublishers.ofString(payload))
    .build();
HttpResponse<String> response = client.send(request, BodyHandlers.ofString());
if (response.statusCode() == 429 || response.statusCode() >= 500) {
    retryWithExponentialBackoff(request); // bounded, jittered retry
}
if (response.statusCode() / 100 != 2) throw new DeliveryApiException(response.body());

// Node.js: validate, send idempotently, verify the signed webhook separately.
const response = await fetch(endpoint, {
  method: 'POST',
  headers: { authorization: `Bearer ${token}`, 'idempotency-key': key,
             'content-type': 'application/json' },
  body: JSON.stringify(payload),
  signal: AbortSignal.timeout(10_000)
});
if ([429, 500, 502, 503, 504].includes(response.status)) await boundedRetry();
if (!response.ok) throw new Error(`Delivery API ${response.status}`);

# Python: typed validation, timeout and bounded retry.
with httpx.Client(cert=("client.crt", "client.key"), timeout=10.0) as client:
    response = client.post(endpoint, json=payload, headers={
        "Authorization": f"Bearer {token}",
        "Idempotency-Key": idempotency_key,
    })
    if response.status_code in {429, 500, 502, 503, 504}:
        raise RetryableDeliveryError(response.text)
    response.raise_for_status()
    result = response.json()

// .NET: use HttpClientFactory, mTLS handler, timeout and idempotency.
using var request = new HttpRequestMessage(HttpMethod.Post, endpoint);
request.Headers.Authorization = new("Bearer", token);
request.Headers.Add("Idempotency-Key", idempotencyKey);
request.Content = JsonContent.Create(payload);
using var response = await client.SendAsync(request, cancellationToken);
if ((int)response.StatusCode == 429 || (int)response.StatusCode >= 500)
    throw new RetryableDeliveryException(await response.Content.ReadAsStringAsync());
response.EnsureSuccessStatusCode();