Guia de remision POST

using System.Text;

using var http = new HttpClient();
http.DefaultRequestHeaders.Add("X-Api-Key", apiKey);
http.DefaultRequestHeaders.Add("Idempotency-Key", "GR-2026-0004");

string json = await File.ReadAllTextAsync("comprobante.json");
using var contenido = new StringContent(json, Encoding.UTF8, "application/json");
using var respuesta = await http.PostAsync(
    "https://staging-api.mynexusapi.com/v1/contribuyentes/0123456789/comprobantes",
    contenido);

Console.WriteLine($"{(int)respuesta.StatusCode} {await respuesta.Content.ReadAsStringAsync()}");

import json, os, requests

headers = {
    "X-Api-Key": os.environ["ECUAFACT_API_KEY"],
    "Idempotency-Key": "GR-2026-0004",
}
with open("comprobante.json", encoding="utf-8") as archivo:
    cuerpo = json.load(archivo)

r = requests.post(
    "https://staging-api.mynexusapi.com/v1/contribuyentes/0123456789/comprobantes",
    headers=headers, json=cuerpo, timeout=30)
print(r.status_code, r.text)

import { readFile } from 'node:fs/promises';

const cuerpo = await readFile('comprobante.json', 'utf8');
const res = await fetch(
  'https://staging-api.mynexusapi.com/v1/contribuyentes/0123456789/comprobantes',
  {
    method: 'POST',
    headers: {
      'X-Api-Key': process.env.ECUAFACT_API_KEY,
      'Idempotency-Key': 'GR-2026-0004',
      'Content-Type': 'application/json'
    },
    body: cuerpo
  });
console.log(res.status, await res.text());

<?php
$ch = curl_init('https://staging-api.mynexusapi.com/v1/contribuyentes/0123456789/comprobantes');
curl_setopt_array($ch, [
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_POST => true,
    CURLOPT_HTTPHEADER => [
        'X-Api-Key: ' . getenv('ECUAFACT_API_KEY'),
        'Idempotency-Key: GR-2026-0004',
        'Content-Type: application/json',
    ],
    CURLOPT_POSTFIELDS => file_get_contents('comprobante.json'),
]);
$respuesta = curl_exec($ch);
$estado = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);
echo $estado . ' ' . $respuesta;

import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
import java.nio.file.Files;
import java.nio.file.Path;

HttpClient cliente = HttpClient.newHttpClient();
String cuerpo = Files.readString(Path.of("comprobante.json"));

HttpRequest peticion = HttpRequest.newBuilder()
    .uri(URI.create("https://staging-api.mynexusapi.com/v1/contribuyentes/0123456789/comprobantes"))
    .header("X-Api-Key", System.getenv("ECUAFACT_API_KEY"))
    .header("Idempotency-Key", "GR-2026-0004")
    .header("Content-Type", "application/json")
    .POST(HttpRequest.BodyPublishers.ofString(cuerpo))
    .build();

HttpResponse<String> respuesta = cliente.send(peticion, HttpResponse.BodyHandlers.ofString());
System.out.println(respuesta.statusCode() + " " + respuesta.body());