Joker.com FAQ
Cancel a domain name registration
We are sorry but this is not possible. Domains are registered in real-time. So please check your domain name carefully to avoid any further problems.
In case you made a typo you will have to start again.
Of course, it is always possible to delete a domain name - but this will not result in a refund. 1)
1) Resellers receive a refund for deletions of gTLDs within 72h after registration