To obtain a GSTIN (Goods and Services Tax Identification Number) in India, you need to register for GST with the GST portal using your PAN card. The process for obtaining a GSTIN involves the following steps:

1. Visit the GST portal and click on the “Register Now” button.
2. Select “New Registration” and fill out the required details such as your name, PAN, email address, and mobile number.
3. After submitting the required details, you will receive an OTP (One Time Password) on your registered mobile number and email address.
4. Enter the OTP and click on the “Proceed” button.
5. Next, you need to fill out the application form for GST registration, which includes details such as your business type, address, bank account details, and nature of business.
6. After submitting the application form, you need to upload the required documents, such as your PAN card, proof of address, and bank statement.
7. Once your application is verified and approved, you will receive your GSTIN and other registration details via email and SMS.

Note that the GSTIN is different from your PAN card number, and you need to apply for GST registration separately. After obtaining your GSTIN, you can link it to your PAN card on the GST portal.

If you have already applied for GST registration and received your GSTIN, but it is not reflecting on the portal, you can contact the GST helpdesk for assistance.