Yes, DDPI is currently mandatory when placing SLB orders. To activate the DDPI, follow these steps:

Online

1. Log into console.zerodha.com.
2. Click on Account.
3. Click on the arrow and then click on Demat.
4. Click on Enable Demat Debit and Pledge Instruction (DDPI).
5. Accept the terms and conditions. Click on Continue.
6. Click on Proceed and then on Sign Now.
7. Accept the terms and conditions. Enter the Aadhaar number.
8. Click on Send OTP.
9. Enter the OTP.
10. Click on Verify & Sign.
    

A charge of ₹100 + 18 % GST is applicable to enable DDPI online. It will be deducted from the Zerodha account balance.

Offline

NRO-PIS, joint account holders, and non-individual account holders can only activate the DDPI offline. To activate the DDPI, courier the DDPI (PDF). Ensure that the signature on DDPI matches the previously uploaded signature while opening the Zerodha account. The uploaded signature can be found by visiting console.zerodha.com/account/documents, selecting Signature proof in the drop-down menu, and clicking on E-mail to me.

Courier it to the following address:

Zerodha,
153/154, 4th Cross, J.P Nagar 4th Phase,
Opp. Clarence Public School,
Bengaluru - 560078

Refer to the sample copy of the DDPI (PDF) to learn where to sign and how to fill the DDPI. Client ID is the 16-digit Demat ID that can be found by visiting console.zerodha.com/account/demat.

The DDPI will be activated within 72 hours, and a confirmation email will be sent once it is processed.