Log in to HDFC NetBanking or the HDFC MobileBanking app
Go to the Cards section
Select Debit Card Services
Choose Apply for New Debit Card
Select the account linked to the debit card
Pick the debit card type if options are available
Confirm the delivery address
Review the details and submit the request
Note the request/reference number for tracking
Alternatively, visit the nearest HDFC Bank branch with your ID and account details to apply in person