Under the "Request" dropdown, look for options like (if you need to unblock a temporarily blocked card) or go to Set Card Controls/Usage Decision .
Understanding the reason is the first step to solving the problem. Common reasons include: unblock hdfc credit card
Tap the icon (three horizontal lines) in the top left corner. Go to Pay > Cards . Tap on your active blocked Credit Card. Select "Show More" and tap on "Customize / Control Card" . Under the "Request" dropdown, look for options like