Enviar documento (PDF, DOC, XLS...)

import requests

response = requests.post(
    'https://api.multimensajes.com/api/mensaje_enviar_documento.php',
    data={
    'key': 'key': 'WA_8_a1b2c3d4e5f6g7h8',
    'destinatario': 'destinatario': '5218711281619',
    'url': 'url': 'https://ejemplo.com/imagen.jpg',
    'filename': 'filename': 'factura.pdf',
    'caption': 'caption': 'Mira esta imagen',
    'directo': 'directo': 'valor_ejemplo'
    },
    timeout=30
)
data = response.json()
print(data)

const fetch = (...args) => import('node-fetch').then(({default: fetch}) => fetch(...args));

const params = new URLSearchParams();
params.append('key', 'WA_8_a1b2c3d4e5f6g7h8');
params.append('destinatario', '5218711281619');
params.append('url', 'https://ejemplo.com/imagen.jpg');
params.append('filename', 'factura.pdf');
params.append('caption', 'Mira esta imagen');
params.append('directo', 'valor_ejemplo');

const response = await fetch('https://api.multimensajes.com/api/mensaje_enviar_documento.php', {
    method: 'POST',
    body: params
});
const data = await response.json();
console.log(data);

curl -X POST 'https://api.multimensajes.com/api/mensaje_enviar_documento.php' \
  -d 'key=WA_8_a1b2c3d4e5f6g7h8' \
  -d 'destinatario=5218711281619' \
  -d 'url=https%3A%2F%2Fejemplo.com%2Fimagen.jpg' \
  -d 'filename=factura.pdf' \
  -d 'caption=Mira+esta+imagen' \
  -d 'directo=valor_ejemplo'

package main

import (
    "fmt"
    "net/url"
    "net/http"
    "io/ioutil"
)

func main() {
    form := url.Values{}
    form.Add("key", "WA_8_a1b2c3d4e5f6g7h8")
    form.Add("destinatario", "5218711281619")
    form.Add("url", "https://ejemplo.com/imagen.jpg")
    form.Add("filename", "factura.pdf")
    form.Add("caption", "Mira esta imagen")
    form.Add("directo", "valor_ejemplo")

    resp, _ := http.PostForm("https://api.multimensajes.com/api/mensaje_enviar_documento.php", form)
    defer resp.Body.Close()
    body, _ := ioutil.ReadAll(resp.Body)
    fmt.Println(string(body))
}

import java.net.HttpURLConnection;
import java.net.URL;
import java.io.OutputStream;
import java.io.BufferedReader;
import java.io.InputStreamReader;

public class WhatsAppAPI {
    public static void main(String[] args) throws Exception {
        URL url = new URL("https://api.multimensajes.com/api/mensaje_enviar_documento.php");
        HttpURLConnection con = (HttpURLConnection) url.openConnection();
        con.setRequestMethod("POST");
        con.setDoOutput(true);
        StringBuilder params = new StringBuilder();
        params.append("key=WA_8_a1b2c3d4e5f6g7h8\&");
        params.append("
        params.append("destinatario=5218711281619\&");
        params.append("
        params.append("url=https%3A%2F%2Fejemplo.com%2Fimagen.jpg\&");
        params.append("
        params.append("filename=factura.pdf\&");
        params.append("
        params.append("caption=Mira+esta+imagen\&");
        params.append("
        params.append("directo=valor_ejemplo\&");
        params.append("
        con.getOutputStream().write(params.toString().getBytes());
        BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));
        String line;
        while ((line = in.readLine()) != null) System.out.println(line);
    }
}

require 'net/http'
require 'uri'
require 'json'

uri = URI('https://api.multimensajes.com/api/mensaje_enviar_documento.php')
http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = true

req = Net::HTTP::Post.new(uri.path)
req.set_form_data(
  'key' => 'WA_8_a1b2c3d4e5f6g7h8',
  'destinatario' => '5218711281619',
  'url' => 'https://ejemplo.com/imagen.jpg',
  'filename' => 'factura.pdf',
  'caption' => 'Mira esta imagen',
  'directo' => 'valor_ejemplo'
)

response = http.request(req)
puts JSON.parse(response.body)

using System;
using System.Net.Http;
using System.Threading.Tasks;
using System.Collections.Generic;

class Program {
    static async Task Main() {
        var client = new HttpClient();
        var form = new FormUrlEncodedContent(new[]
        {
            new KeyValuePair<string, string>("key", "WA_8_a1b2c3d4e5f6g7h8"),
            new KeyValuePair<string, string>("destinatario", "5218711281619"),
            new KeyValuePair<string, string>("url", "https://ejemplo.com/imagen.jpg"),
            new KeyValuePair<string, string>("filename", "factura.pdf"),
            new KeyValuePair<string, string>("caption", "Mira esta imagen"),
            new KeyValuePair<string, string>("directo", "valor_ejemplo")
        });
        var response = await client.PostAsync("https://api.multimensajes.com/api/mensaje_enviar_documento.php", form);
        var content = await response.Content.ReadAsStringAsync();
        Console.WriteLine(content);
    }
}