Dear Ibtisam,
Thank you for contacting us regarding your "PIN certificate download".
Please go to
https://mapato1.kra.go.ke/itms/ and use your username/password to login. The system is interactive so it also allows you to recover your login details via e-mail if you already registered. If you are not already registered, you can register using your PIN number. From there you can download/print your PIN certificate when you click on Registration Certificate -> Enquire
In case of any trouble with the DIY link, please feel free to call us on 020 4 999 999 for assistance.
Our KRA representative will be more than glad to be of assistance.
Lipa usuru, jenga nchi :-)