How to Verify My iTunes Paymentby Mario CalhounUpdated September 28, 2017
If your iTunes purchases aren't going through after clicking the "Buy" button, you'll need to verify your account information. The iTunes Store will occasionally prompt you to verify your payment method when changes are made to the store's license agreement, which requires you to re-enter the security code found on your credit or debit card. All purchases are placed on hold until you accept the new agreement and verify the current information in your account is up to date.
Open your email manager and click the email message from Apple. Click the verification link to launch the iTunes program on your computer and direct the program to the iTunes Store.
Enter your iTunes password and click "Sign In."
Click "Edit" next to Payment Information in iTunes, and re-enter your three-digit security code located on the back of your credit/debit card.
Click "Done" to save the changes and click "Home" at the top of iTunes to return to the main iTunes Store window.