So when you create your URL shortner - you receive an admin URL : similiar to this

admin_url:“https://hyperlinkto.com/s/admin/XYDQ5_5O8KNKZ1”

The secret key will be in this case : XYDQ5_5O8KNKZ1

It is basically a key that allows to access your shortened URL for deletion - or to see updates on it.

You will be able to see the number of clicks, and other info like the following:

id:55
target_url:"http://www.tarekalaaddin.com"
url:"https://hyperlinkto.com/s/XYDQ5"
admin_url:"https://hyperlinkto.com/s/admin/XYDQ5_5O8KNKZ1"
is_active:true
clicks:0
created_date:"2023-04-25T12:04:38.807253"
updated_date:null