hello sir i have iphone 5s recently puchased but my problem is i want payment my account at that payment session all the details filled correctly but it shows every time authentication error my payment is shows failed plz resolve my problem

What is the exact text of the error message, and what are you trying to use as your payment method, credit card, debit card ... ? If it's a debit card then not all seem to still be accepted, and might not be accepted at all in some countries.

For a card to have a chance of being accepted it needs to be registered to the same name and address (including format and spacing etc) that you have on your iTunes account, and have been issued by a bank in the country where you are (and therefore the country which is on your iTunes account).

(And as you are already know, you are talking to fellow users on these forums, not iTunes Support nor Apple.)