If you are looking for a free URL Shortener,
you can try this one - Firebase Dynamic Links.

1. Create a Firebase project if you don't have any.
2. Copy your "Web API Key"
3. Create a Domain in the Dynamic Links section if you don't have any.
4. You need to Specify the Whitelist URL pattern

Or you can use this one instead:

key: AIzaSyAXRo1vR7ncSXBGI8i_RN4Ggx19PpoJ_tY

domain: https://fbdnml.page.link