Yes, It's Absolutely Safe to use debit/credit card, net banking or any other online payment method on MyFitFuel website.

Myfitfuel.in uses the latest encryption technology and other methods to protect your Debit/credit card information. You can place your orders using Netscape's SSL encryption (the Internet standard for secure transactions). In fact, shopping online with a Debit/credit card at MyFitFuel.in is even safer than using a credit card at a restaurant because we do not retain your card information. 

You can be assured that MyFitFuel.in offers you the highest standards of security currently available on the Net and that your shopping experience is private, safe and secure. You need not worry about your credit card information because your bank will authorize the Debit/credit card transaction directly without any information passing through us. 

In approximately 25-30 seconds (depending on your internet connection) your bank will issue an authorization number and the electronic receipt would be generated.

Paytm and Pay with Amazon (Amazon Payment Gateway) have their own secure transaction methods which will always keep you protected.