It is mandatory to carry a government issued photo identification (ID) proof along with the E-Ticket copy. The same is verified by the airport security as well as the airline at the check in counter. On presenting your photo ID proof and E-Ticket copy, your boarding pass will be issued. For international flights, your passport is the only valid photo ID proof that will be accepted. In case of an infant travelling, it is mandatory to carry the birth certificate of the infant along with the ticket.
It is not mandatory to carry the credit/debit card that was used to make the payment at the time of the booking, if you have booked through holidaytravel.co. (we do not pass on your account details to the airline).