By clicking on ‘Secure login ’, you accept that you have read our Terms & conditions, Privacy Policy and the Tips for Safe Banking Login to the Kotak FASTag Portal with your User ID and check the latest transaction history \u0026amp; balance.\u003c/p\u003e\r\n\u003cp\u003e3. FASTag is a device that uses Radio Frequency Identification (RFID) technology for making toll payments directly from a prepaid account linked to it. It is affixed on the windscreen of a vehicle. Where I can get the login id for my FASTag wallet? Your FASTag wallet login user id is your Registered Mobile number and a Password which would be sent to you on your registered email id. For First time login - Create New password minimum of 8 characters in combination of alphabet, numeric & special character.