mình làm nhưng nó nói vậy "The Card Verification System used by PayPal is currently unavailable. Please try to add your card at a later time. We apologize for this inconvenience."
Xin hỏi lỗi này là gì vậy: The Card Verification System used by PayPal is currently unavailable. Please try to add your card at a later time. We apologize for this inconvenience