Send transactional messages on WhatsApp at scale

curl --location 'https://cpaas.zoho.com/v1.1/whatsapp' \
  --header 'Content-Type: application/json' \
  --header 'Authorization: <Authorization-token>' \
  --data '{
    "from": "<FROM_PHONE_NUMBER>",
    "to": "<TO_PHONE_NUMBER>",
    "template_key": "<TEMPLATE_KEY>",
    "merge_info": {"<merge_key>": "<merge_value>"}
  }'
                                            

using System;
using System.Net;
using System.Text;
using System.IO;
using Newtonsoft.Json.Linq;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            System.Net.ServicePointManager.SecurityProtocol = System.Net.SecurityProtocolType.Tls12;
            var baseAddress = "https://cpaas.zoho.com/v1.1/whatsapp";

            var http = (HttpWebRequest)WebRequest.Create(new Uri(baseAddress));
            http.Accept = "application/json";
            http.ContentType = "application/json";
            http.Method = "POST";
            http.PreAuthenticate = true;
            http.Headers.Add("Authorization", "<Authorization-token>");

            JObject parsedContent = JObject.Parse("{'from': '<FROM_PHONE_NUMBER>','to': '<TO_PHONE_NUMBER>','template_key': '<TEMPLATE_KEY>','merge_info': {'<merge_key>': '<merge_value>'}}");

            ASCIIEncoding encoding = new ASCIIEncoding();
            Byte[] bytes = encoding.GetBytes(parsedContent.ToString());
            Stream newStream = http.GetRequestStream();
            newStream.Write(bytes, 0, bytes.Length);
            newStream.Close();

            var response = http.GetResponse();
            var stream = response.GetResponseStream();
            var sr = new StreamReader(stream);
            var content = sr.ReadToEnd();
            Console.WriteLine(content);
        }
    }
}
                                            

import requests
import json

url = "https://cpaas.zoho.com/v1.1/whatsapp"

payload = json.dumps({
    "from": "<FROM_PHONE_NUMBER>",
    "to": "<TO_PHONE_NUMBER>",
    "template_key": "<TEMPLATE_KEY>",
    "merge_info": {"<merge_key>": "<merge_value>"}
})

headers = {
    "accept": "application/json",
    "content-type": "application/json",
    "authorization": "<Authorization-token>"
}

response = requests.request("POST", url, data=payload, headers=headers)
print(response.text)
                                            

<?php

$curl = curl_init();

curl_setopt_array($curl, array(
    CURLOPT_URL => "https://cpaas.zoho.com/v1.1/whatsapp",
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_ENCODING => "",
    CURLOPT_MAXREDIRS => 10,
    CURLOPT_TIMEOUT => 30,
    CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
    CURLOPT_CUSTOMREQUEST => "POST",
    CURLOPT_POSTFIELDS => json_encode(array(
        "from" => "<FROM_PHONE_NUMBER>",
        "to" => "<TO_PHONE_NUMBER>",
        "template_key" => "<TEMPLATE_KEY>",
        "merge_info" => array(
            "<merge_key>" => "<merge_value>"
        )
    )),
    CURLOPT_HTTPHEADER => array(
        "accept: application/json",
        "authorization: <Authorization-token>",
        "cache-control: no-cache",
        "content-type: application/json"
    ),
));

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
    echo "cURL Error #:" . $err;
} else {
    echo $response;
}
?>
                                            

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import org.json.JSONObject;

public class WabaTemplateSendApi {
    public static void main(String[] args) throws Exception {
        String postUrl = "https://cpaas.zoho.com/v1.1/whatsapp";
        BufferedReader br = null;
        HttpURLConnection conn = null;
        String output = null;
        StringBuffer sb = new StringBuffer();
        try {
            URL url = new URL(postUrl);
            conn = (HttpURLConnection) url.openConnection();
            conn.setDoOutput(true);
            conn.setRequestMethod("POST");
            conn.setRequestProperty("Content-Type", "application/json");
            conn.setRequestProperty("Accept", "application/json");
            conn.setRequestProperty("Authorization", "<Authorization-token>");

            JSONObject mergeInfo = new JSONObject();
            mergeInfo.put("<merge_key>", "<merge_value>");

            JSONObject body = new JSONObject();
            body.put("from", "<FROM_PHONE_NUMBER>");
            body.put("to", "<TO_PHONE_NUMBER>");
            body.put("template_key", "<TEMPLATE_KEY>");
            body.put("merge_info", mergeInfo);

            OutputStream os = conn.getOutputStream();
            os.write(body.toString().getBytes());
            os.flush();

            br = new BufferedReader(new InputStreamReader((conn.getInputStream())));
            while ((output = br.readLine()) != null) {
                sb.append(output);
            }
            System.out.println(sb.toString());
        } catch (Exception e) {
            br = new BufferedReader(new InputStreamReader((conn.getErrorStream())));
            while ((output = br.readLine()) != null) {
                sb.append(output);
            }
            System.out.println(sb.toString());
        } finally {
            if (br != null) br.close();
            if (conn != null) conn.disconnect();
        }
    }
}