i want to add the DDNS service to my tplink router

The router suggest,:
Update URL: Enter the URL provided by your DDNS service provider in format of “http://[USERNAME]:[PASSWORD]@api.cp.easydns.com/dyn/tomato.php?hostname=[DOMAIN]&myip=[IP]”. The router will automatically update user information to the service provider.

i tried
https://api.dynu.com/nic/update?username=[USERNAME]&password=[PASSWORD]&hostname=[DOMAIN]

but no success

What would be the correct way to do it?

Regards