Hello from parent!

iframe:
<iframe src="https://app.leadfy.xyz/child.html" width="100%" height="100%"></iframe>

<script>
    window.addEventListener('message', function(event) {
        msgToRN(event);
    });
  
    function msgToRN(event = null) {
      let data;

      if (event){
        data = event.data
        window.parent.postMessage(data, '*');
      } else {
        data = { type: 'webview_message', cmd: 'replace_screen', screen: 'formScreen', params: { spec: "whatsapp/spec/form?object_id=21668" }};
        window.parent.postMessage(JSON.stringify(data), '*');
      }
    }
  
    document.getElementById("btn").addEventListener("click", msgToRN);
  </script>
  
  <button id="btn" onclick="msgToRN()">Enviar (Pai)</button>