how to use idfc cc/dc point in idfc cc bill payment

Its not.

IDFC cc points can be redeemed only on non billers like ecom, some govt services like taxes.

IDFC DC has its redemption site with agvs etc with a redemption fee of 99 + get. In a single go one can redeem 5 vouchers at max. Of late the highest agv denomination is 500rs. Myntra is 5K

IDFC cc i used during gold purchase on FK and they charged 99+GST for redeeming. The points will be redeemed and after 2-3 days the a charge of 99+GST will appear in stmt.

Don't redeem unless you accrue huge number of points. There's no point in paying 118₹ as charges for redeeming points