Simple Google Apps Script, which can be used as a Fulcrum webhook endpoint to email the webhook JSON payload for debugging. Required URL parameter: email. Optional URL parameter: form (Fulcrum form_id).

fulcrum_email_webhook.gs

function doPost(e){
  return handleResponse(e);
}

function handleResponse(e) {
  var email = e.parameter.email;
  var form = e.parameter.form;
  var jsonString = e.postData.getDataAsString();
  var payload = JSON.parse(jsonString);
  var subject = "Fulcrum Webhook Payload";
  
  if (form && form.length) {
    if (payload.data.form_id === form) {
      if (payload.type === "record.create") {
        subject = "New Fulcrum record created";
        sendMail();
      } else if (payload.type === "record.update") {
        subject = "Fulcrum record updated";
        sendMail();
      } else if (payload.type === "record.delete") {
        subject = "Fulcrum record deleted";
        sendMail();
      }
    }
  } else {
    sendMail();
  }
  
  function sendMail() {
    MailApp.sendEmail({
      to: email,
      name: "Fulcrum Webhook",
      subject: subject,
      htmlBody: jsonString
    });
  }
}