Step 1: Sign Up / Login to your GST Application account. icai.expressgst.com

Step 2: Right Click on the top right corner of the screen that appears next >> My Subscription Plan.

Step 3: Fill the Plan Subscription Page and apply the Voucher Code as
1.  "KDKICAI" for plan i-Express Go
2. "KDKICAI1" for plan i-Express Mile

3. "KDKICAI2" for plan i-Express Evolve
and then click on "Apply".

Step 4: The voucher when applied will appear as follows:

Step 5:  Click on Make Payment Button to Proceed. The plan will then get automatically activated.

Sign up link icai.expressgst.com