<title>Teste Widget ZapSign</title>
<iframe src="https://app.zapsign.com.br/verificar/TOKEN-DO-SIGNATÁRIO" width="100%" height="800px"></iframe>
window.onmessage = function(e){
if(e.data === 'zs-doc-loaded'){
alert('Doc loaded in iframe')
if(e.data === 'zs-doc-signed'){
alert('Doc signed by signer')
if(e.data === 'zs-signed-file-ready'){
alert('Signed file (final pdf) ready to download')