curl -X POST http://<tu-host>:3000/api/send-message \
  -H 'Content-Type: application/json' \
  -d '{
    "instanceId":33,
    "token":"TOKEN",
    "to":"+573001112233",
    "type":"text",
    "message":"Hola 👋"
  }'

<?php
$ch = curl_init('http://<tu-host>:3000/api/send-message');
curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode([
  'instanceId' => 33,
  'token' => 'TOKEN',
  'to' => '+573001112233',
  'type' => 'text',
  'message' => 'Hola 👋'
]));
curl_setopt($ch, CURLOPT_HTTPHEADER, ['Content-Type: application/json']);
curl_exec($ch);
?>

import fetch from 'node-fetch';
fetch('http://<tu-host>:3000/api/send-message', {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({ instanceId:33, token:'TOKEN', to:'+573001112233', type:'text', message:'Hola 👋' })
});

fetch('http://<tu-host>:3000/api/send-message', {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({ instanceId:33, token:'TOKEN', to:'+573001112233', type:'text', message:'Hola 👋' })
});

import requests
requests.post('http://<tu-host>:3000/api/send-message',
              json={'instanceId':33,'token':'TOKEN','to':'+573001112233','type':'text','message':'Hola 👋'})

HttpClient client = HttpClient.newHttpClient();
HttpRequest request = HttpRequest.newBuilder()
  .uri(URI.create("http://<tu-host>:3000/api/send-message"))
  .header("Content-Type", "application/json")
  .POST(HttpRequest.BodyPublishers.ofString("{\"instanceId\":33,\"token\":\"TOKEN\",\"to\":\"+573001112233\",\"type\":\"text\",\"message\":\"Hola 👋\"}"))
  .build();
client.send(request, HttpResponse.BodyHandlers.ofString());

require 'net/http'
require 'json'
Net::HTTP.post URI('http://<tu-host>:3000/api/send-message'),
  {instanceId:33, token:'TOKEN', to:'+573001112233', type:'text', message:'Hola 👋'}.to_json,
  "Content-Type" => "application/json"

Imports System.Net
Imports System.Text
Dim data = "{\"instanceId\":33,\"token\":\"TOKEN\",\"to\":\"+573001112233\",\"type\":\"text\",\"message\":\"Hola 👋\"}"
Dim client As New WebClient()
client.Headers(HttpRequestHeader.ContentType) = "application/json"
client.UploadString("http://<tu-host>:3000/api/send-message", data)

using var client = new HttpClient();
var content = new StringContent("{\"instanceId\":33,\"token\":\"TOKEN\",\"to\":\"+573001112233\",\"type\":\"text\",\"message\":\"Hola 👋\"}", Encoding.UTF8, "application/json");
await client.PostAsync("http://<tu-host>:3000/api/send-message", content);

package main
import ("bytes"; "net/http")
func main() {
  http.Post("http://<tu-host>:3000/api/send-message", "application/json",
    bytes.NewBuffer([]byte(`{"instanceId":33,"token":"TOKEN","to":"+573001112233","type":"text","message":"Hola 👋"}`)))
}

#include <curl/curl.h>
int main(){
  CURL *curl = curl_easy_init();
  if(curl){
    const char *data = "{\"instanceId\":33,\"token\":\"TOKEN\",\"to\":\"+573001112233\",\"type\":\"text\",\"message\":\"Hola 👋\"}";
    curl_easy_setopt(curl, CURLOPT_URL, "http://<tu-host>:3000/api/send-message");
    curl_easy_setopt(curl, CURLOPT_POSTFIELDS, data);
    struct curl_slist *headers = NULL;
    headers = curl_slist_append(headers, "Content-Type: application/json");
    curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);
    curl_easy_perform(curl);
    curl_easy_cleanup(curl);
  }
  return 0;
}

(require '[clj-http.client :as client])
(client/post "http://<tu-host>:3000/api/send-message"
             {:headers {"Content-Type" "application/json"}
              :body "{\"instanceId\":33,\"token\":\"TOKEN\",\"to\":\"+573001112233\",\"type\":\"text\",\"message\":\"Hola 👋\"}"})

import 'package:http/http.dart' as http;
void main() {
  http.post(Uri.parse('http://<tu-host>:3000/api/send-message'),
    headers:{'Content-Type':'application/json'},
    body:'{"instanceId":33,"token":"TOKEN","to":"+573001112233","type":"text","message":"Hola 👋"}');
}

import Foundation
let url = URL(string: "http://<tu-host>:3000/api/send-message")!
var req = URLRequest(url: url)
req.httpMethod = "POST"
req.addValue("application/json", forHTTPHeaderField: "Content-Type")
req.httpBody = "{\"instanceId\":33,\"token\":\"TOKEN\",\"to\":\"+573001112233\",\"type\":\"text\",\"message\":\"Hola 👋\"}".data(using: .utf8)
URLSession.shared.dataTask(with: req).resume()

#import <Foundation/Foundation.h>
int main(){
  NSURL *url = [NSURL URLWithString:@"http://<tu-host>:3000/api/send-message"];
  NSMutableURLRequest *req = [NSMutableURLRequest requestWithURL:url];
  req.HTTPMethod = @"POST";
  [req addValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
  req.HTTPBody = [@"{\"instanceId\":33,\"token\":\"TOKEN\",\"to\":\"+573001112233\",\"type\":\"text\",\"message\":\"Hola 👋\"}" dataUsingEncoding:NSUTF8StringEncoding];
  [[[NSURLSession sharedSession] dataTaskWithRequest:req] resume];
  return 0;
}

Invoke-RestMethod -Uri http://<tu-host>:3000/api/send-message -Method Post -Body '{"instanceId":33,"token":"TOKEN","to":"+573001112233","type":"text","message":"Hola 👋"}' -ContentType 'application/json'

wget --method=POST --header='Content-Type: application/json' \
  --body-data='{"instanceId":33,"token":"TOKEN","to":"+573001112233","type":"text","message":"Hola 👋"}' \
  http://<tu-host>:3000/api/send-message