Getting Error Daily Limit for Unauthenticated Use Exceeded in Google Sheets for URL Shortener API - google-apps-script

Question

I am getting "Error Daily Limit for Unauthenticated Use Exceeded. Continued use requires signup" in google sheets with using URL Shortener API (image as below)
Below is my code in Script Editor
function shortenURL(urlField) {
var toShorten = UrlShortener.newUrl().setLongUrl(urlField);
var shortened = UrlShortener.Url.insert(toShorten);
return shortened.getId();
}
I have bonded to the API through Google Sheets build-in setting from "Cloud Platform Project", enabled URL Shortener API in "Advanced Google Services", enabled it in Google API Console, and created both API and OAuth (image as below). Besides, I was just using it for less than 20 cells in the Google Sheets, and so I am sure it is way less than the quote given by Google.
Cloud Platform Project
Advanced Google Services
Enable in Google API Console
If I use the below code (mentioned here), it works fine.
However, I want the script to run automatically as the function instead of by clicking the button. Therefore, I still want to solve the error.
function onOpen() {
SpreadsheetApp.getUi()
.createMenu("Shorten")
.addItem("Go !!","rangeShort")
.addToUi()
}
function rangeShort() {
var range = SpreadsheetApp.getActiveRange(), data = range.getValues();
var output = [];
for(var i = 0, iLen = data.length; i < iLen; i++) {
var url = UrlShortener.Url.insert({longUrl: data[i][0]});
output.push([url.id]);
}
range.offset(0,1).setValues(output);
}
I found some post mentioned the solution to this error is to apply authentication to the requests to Google. However, I have already created API key and OAuth and bond them to Google Sheets through those Google Sheets build-in setting.
Is there any solution to the error?
If the error occurs due to authentication issue, how I can apply the authentication in addition to those setting I have already done?

Answer 1

Try sending a POST request to UrlShortener API endpoint instead of using the UrlShortener service in Apps Script. With UrlShortener.Url.insert(), I quickly hit the usage quota.
Append the API url with the 'key' parameter and set it equal to the API key you obtained from Developer console.
In the body of your POST request, set 'muteHttpExceptions' to 'true' to log all error messages as beautified JSON.
var API_KEY = "YOUR_API_KEY";
function shortenUrl(longUrl) {
var apiEndpoint = "https://www.googleapis.com/urlshortener/v1/url?key=" + API_KEY;
var data = {
"longUrl": longUrl
}
var options = {
"method": "post",
"contentType": "application/json",
"muteHttpExceptions": true,
"payload": JSON.stringify(data)
};
var response = UrlFetchApp.fetch(apiEndpoint, options).getContentText();
var data = JSON.parse(response);
return data.id;
}