Welcome messages in a WhatsApp group when someone joins

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://gate.whapi.cloud/messages/text",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => "{\"to\":\"[email protected]\",\"body\":\"Welcome to the group! Read the rules below and say hello.\"}",
  CURLOPT_HTTPHEADER => [
    "accept: application/json",
    "authorization: Bearer Your_Token",
    "content-type: application/json"
  ],
]);

$response = curl_exec($curl);
curl_close($curl);
echo $response;

import requests

url = "https://gate.whapi.cloud/messages/text"
payload = {
    "to": "[email protected]",
    "body": "Welcome to the group! Read the rules below and say hello."
}
headers = {
    "accept": "application/json",
    "authorization": "Bearer Your_Token",
    "content-type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)
print(response.text)

const response = await fetch('https://gate.whapi.cloud/messages/text', {
  method: 'POST',
  headers: {
    accept: 'application/json',
    authorization: 'Bearer Your_Token',
    'content-type': 'application/json',
  },
  body: JSON.stringify({
    to: '[email protected]',
    body: 'Welcome to the group! Read the rules below and say hello.',
  }),
});

console.log(await response.text());

OkHttpClient client = new OkHttpClient();

MediaType mediaType = MediaType.parse("application/json");
RequestBody body = RequestBody.create(mediaType, "{\"to\":\"[email protected]\",\"body\":\"Welcome to the group! Read the rules below and say hello.\"}");
Request request = new Request.Builder()
  .url("https://gate.whapi.cloud/messages/text")
  .post(body)
  .addHeader("accept", "application/json")
  .addHeader("authorization", "Bearer Your_Token")
  .addHeader("content-type", "application/json")
  .build();

Response response = client.newCall(request).execute();

using RestSharp;

var options = new RestClientOptions("https://gate.whapi.cloud/messages/text");
var client = new RestClient(options);
var request = new RestRequest("");
request.AddHeader("accept", "application/json");
request.AddHeader("authorization", "Bearer Your_Token");
request.AddHeader("content-type", "application/json");
request.AddJsonBody(new { to = "[email protected]", body = "Welcome to the group! Read the rules below and say hello." });
var response = await client.PostAsync(request);

Console.WriteLine("{0}", response.Content);

package main

import (
	"bytes"
	"fmt"
	"io"
	"net/http"
)

func main() {
	body := []byte(`{"to":"[email protected]","body":"Welcome to the group! Read the rules below and say hello."}`)
	req, _ := http.NewRequest("POST", "https://gate.whapi.cloud/messages/text", bytes.NewReader(body))
	req.Header.Set("accept", "application/json")
	req.Header.Set("authorization", "Bearer Your_Token")
	req.Header.Set("content-type", "application/json")

	res, _ := http.DefaultClient.Do(req)
	defer res.Body.Close()
	out, _ := io.ReadAll(res.Body)
	fmt.Println(string(out))
}