index.html

<!DOCTYPE html>
<html lang="en">
  <head>
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>WAPI</title>
  </head>
  <body>

    <h1>WAPI</h1>
    <form>
      <label>Penerima</label><br/>
      <input type="tel" name="recive" id="recive" placeholder="6212345678901" required><br/><br/>
      <label>Url Gambar <span style="color: red;font-size: 12px;">(*Kosongkan jika ingin pesan saja)</span></label><br/>
      <input type="text" name="gambar" id="gambar" placeholder="https://your.url/image.jpg"><br/><br/>
      <label>Pesan</label><br/>
      <textarea name="subject" id="subject" placeholder="Anyting your want to text in here!" required></textarea><br/><br/>
      <button onclick="btnSendWApi()">Kirim</button>
    </form>
    <script type="text/javascript" src="index.js"></script>
    
  </body>
</html>