Enable API Access
You need to enable API access from your account in the GSTN portal to receive OTP on your mobile number.
Note: This will be used only for OTP generation.
To enable API access:
- Log in to GSTN Portal at www.gst.gov.in.
 - Click your name in the top right corner of the page and select My Profile.
 - Click the Manage API Access from Quick Links.
 - Click Yes and select a duration from the dropdown.
 - Click CONFIRM.