your payment method was declined.please enter valid payment information
i m new on mac os x when i sign in on istore or iTunes it say review your information,and when i goto review it say enter payment method when i entered payment information is say an error of "YOUR PAYMENT METHOD WAS DECLINED PLEASE ENTER VALID PAYMENT METHOD INFORMATION" what can i do,And therefor I'm unable tto download any app from app store please give me a solution
MacBook Air, OS X Yosemite (10.10.4)