Google API Key

You can use your own Google API Key for URL Shortener.

You can get the details here, how to create the Google API Key.

https://support.google.com/cloud/answer/6158862

After creating the API key, you can set it in the Linklibs app.

To do that click on the Settings button on the top toolbar.

A window will popup, just add the key in the box below the Google API Key.