We send an OTP via SMS to your mobile whenever you spend online to ensure it is really you who is making the payment for goods or services. Just an extra layer of protection for you to give you peace of mind.
Having a numberless card does make it harder for fraudsters to get your card details, so unless someone sees your card details when you view and receive them in the app, the odds of them ever getting them remain low.
The other exposure risk to card details is if you save them at an unsecured site. We suggest not storing any card information online unless it's a large e-commerce platform or Google pay number storage.