Google Sheet API v4

I believe you are missing API in the url. This is from google spreadsheet api doc.

To acquire an API key:

Open the Credentials page in the API Console.

API keys: A request that does not provide an OAuth 2.0 token must send
an API key. The key identifies your project and provides API access,
quota, and reports.

The API supports several types of restrictions on API keys. If the API
key that you need doesn’t already exist, then create an API key in the
Console by clicking Create credentials > API key. You can restrict the
key before using it in production by clicking Restrict key and
selecting one of the Restrictions. To keep your API keys secure,
follow the best practices for securely using API keys.

After you have an API key, your application can append the query
parameter key=yourAPIKey to all request URLs.

The API key is safe for embedding in URLs; it doesn’t need any
encoding.

Google Spreadsheet Docs

Leave a Comment