i need some clear idea on amazon kindle here.

im using kindle android here. i try to buy a digital book here. i put all the credit card and everything. using MY cc. then the order is in process. but in same time i see the book already in my kindle. is this normal?

this my first time using amazon service

ok already confirm with cc company the transaction is success. but weird why it does not asking for three digit number behind. -___-"