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To make the like goal update automatically, it needs a "key" to safely ask YouTube for your live stats. It is completely free and takes about 2 minutes to set up!
Log into your Google account and go to the Google Cloud Console.
At the top left, click the dropdown next to the Google Cloud logo and click "New Project". Name it something simple like "Stream Widget" and click Create.
Once your project is created, type "YouTube Data API v3" into the top search bar and click it. On the next page, click the big blue Enable button.
Look at the left sidebar menu and click Credentials. Click the "+ Create Credentials" button at the top, and select API Key. A popup will appear with your new key!
Copy the long string of letters and numbers (it usually starts with AIzaSy...) and paste it into the YouTube API Key box in the generator above.