Submit a Google Form from App Script (Google Spreadsheet)

Google App script - Post a Google Form.js

//https://stackoverflow.com/questions/20410497/use-app-scripts-to-open-form-and-make-a-selection?utm_medium=organic&utm_source=google_rich_qa&utm_campaign=google_rich_qa
// Simulate POST to form
function sendHttpPost() {

  // Copy the entire URL from <form action>
  var formAction = "https://docs.google.com/forms/d/e/KEY/formResponse";

  var payload = {
    "entry.888888888": "6689898",            // Number

  };

  // Because payload is a JavaScript object, it will be interpreted as
  // an HTML form. (We do not need to specify contentType; it will
  // automatically default to either 'application/x-www-form-urlencoded'
  // or 'multipart/form-data')

  var options = {
    "method": "post",
    "payload": payload
  };

  var response = UrlFetchApp.fetch(formAction, options);
}