curl --request POST \
  --url https://web-api.clerk.chat/public/campaigns \
  --header 'Content-Type: application/json' \
  --header 'apiKey: <api-key>' \
  --data '
{
  "sender": "+1415456789",
  "listName": "PremiumTierSubscribers",
  "mediaUrls": [
    "https://example.com/image.jpg"
  ],
  "body": "Hello, world!",
  "provider": "whatsapp",
  "name": "Sale Reminder"
}
'

import requests

url = "https://web-api.clerk.chat/public/campaigns"

payload = {
    "sender": "+1415456789",
    "listName": "PremiumTierSubscribers",
    "mediaUrls": ["https://example.com/image.jpg"],
    "body": "Hello, world!",
    "provider": "whatsapp",
    "name": "Sale Reminder"
}
headers = {
    "apiKey": "<api-key>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {apiKey: '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    sender: '+1415456789',
    listName: 'PremiumTierSubscribers',
    mediaUrls: ['https://example.com/image.jpg'],
    body: JSON.stringify('Hello, world!'),
    provider: 'whatsapp',
    name: 'Sale Reminder'
  })
};

fetch('https://web-api.clerk.chat/public/campaigns', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://web-api.clerk.chat/public/campaigns",
  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([
    'sender' => '+1415456789',
    'listName' => 'PremiumTierSubscribers',
    'mediaUrls' => [
        'https://example.com/image.jpg'
    ],
    'body' => 'Hello, world!',
    'provider' => 'whatsapp',
    'name' => 'Sale Reminder'
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "apiKey: <api-key>"
  ],
]);

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

curl_close($curl);

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

package main

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

func main() {

	url := "https://web-api.clerk.chat/public/campaigns"

	payload := strings.NewReader("{\n  \"sender\": \"+1415456789\",\n  \"listName\": \"PremiumTierSubscribers\",\n  \"mediaUrls\": [\n    \"https://example.com/image.jpg\"\n  ],\n  \"body\": \"Hello, world!\",\n  \"provider\": \"whatsapp\",\n  \"name\": \"Sale Reminder\"\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("apiKey", "<api-key>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://web-api.clerk.chat/public/campaigns")
  .header("apiKey", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"sender\": \"+1415456789\",\n  \"listName\": \"PremiumTierSubscribers\",\n  \"mediaUrls\": [\n    \"https://example.com/image.jpg\"\n  ],\n  \"body\": \"Hello, world!\",\n  \"provider\": \"whatsapp\",\n  \"name\": \"Sale Reminder\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://web-api.clerk.chat/public/campaigns")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["apiKey"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"sender\": \"+1415456789\",\n  \"listName\": \"PremiumTierSubscribers\",\n  \"mediaUrls\": [\n    \"https://example.com/image.jpg\"\n  ],\n  \"body\": \"Hello, world!\",\n  \"provider\": \"whatsapp\",\n  \"name\": \"Sale Reminder\"\n}"

response = http.request(request)
puts response.read_body

{
  "data": {
    "id": 1,
    "body": "Hello, world!",
    "teamId": "1",
    "userId": "1",
    "name": "October Sale Reminder",
    "inboxId": "00000000-0000-0000-0000-000000000000",
    "status": "scheduled",
    "created": "2021-01-01T00:00:00.000Z",
    "updated": "2021-01-01T00:00:00.000Z",
    "error": "<string>"
  }
}