Cst required?

Hello Experts,

We run an online clothing store from Bangalore. All payments will be done by customers online through our payment gateway to an account maintained in Bangalore. Now, we also want to start shipping products around the country. So, do we have to pay CST when shipping outside the state even though the invoicing is done in Bangalore? If so, how much?

Any help would be appreciated.

Thanks -

Arun