I guess you are talking about Identification Code.
We send you a Identification code when you reach the minimum payout level(currently Rs.1000) through post to your address provided by you it will take 2-3 weeks to reach you.
Please note that if you have reached the payout limit then please update your address.
then you just have to update your payment profile page with that code.
This is a one time activation. So from next time for your payment you don't have to enter it again.