@Bapun Raz , He said that he's an ICICI account holder...I am wondering then why he needed to enter his address details manually then....
In my opinion, if you already hold a card from ICICI, it's an instant approval process with no document collection, physical verification etc...
But if you don't have an ICICI credit card, you will have to apply for the card manually like a normal credit card application procedure even if you have a savings account with them...
I remember, when I applied I was asked if I already have an ICICI credit card...I think for people who don't have it, Amazon is redirecting them to the ICICI site to complete the application procedure...But people who already have a card, everything was instantly approved on Amazon itself...
Also about that pin code issue : Some banks block some pin-codes & they don't provide cards in those pin-codes...I first experienced that with HDFC...All banks give cards to my pincode but everytime I used to apply for an HDFC card, they used to tell me that they don't provide cards in my pin-code...Then I opened a savings account in the nearby HDFC bank & HDFC gave me the card easily...But a few banks still don't give cards even if you have account with them if the area pincode is in their block-list...