If I intentionally break the fast on Ramadan for several days, do I have to pay kaffara for each day? And how much must I pay.

You are doing very big mistake, for which you have to seek:
1- Forgiveness.
2- Re-make all the days you broke.
3- Pay kaffarah,which is feeding 60 needy persons per day, by handing 750 gm's of either rice, flour or dates to each one, for every single day.