Hi @kalyanikoul,
Welcome to the community,
As per your curl request, you need to replace your domain name and API key of your freshservice account
which I had highlighted in the below code snippet
curl -u “apikey:iCs6hBU69mFm07s9nKaT” -H “Content-Type: application/json” -v -i GET https://domain.freshservice.com/helpdesk/tickets.json
you can find the domain name in your freshservice URL i.e
https://XYZ.freshservice.com -> xyz is your domain name
and you can find the API key in your profile settings