For information on how to pay an unpaid balance in the iTunes Store, see this page:
https://support.apple.com/HT203005
You can also pay for this order by redeeming an iTunes Gift Card. See this page for more information:
http://support.apple.com/HT201209
If you choose this option, after you redeem the code, the unpaid order will be deducted from your store credit balance.
If you’re not sure what your recent order was for, you can see it by following the steps in this article:
https://support.apple.com/HT204088
You can also review your purchases from the last 90 days at our Report a Problem page:
https://reportaproblem.apple.com
If you still have questions about this order, contact our phone team. To find the right contact information for your location, see this page:
https://support.apple.com/HT201232
Let the Advisor know that you contacted iTunes Store Support by email, and give them your case number:
100075535620
I look forward to receiving your reply, Chonticha, so that I can resolve this matter for you. As soon as we’re able to process your order, I’ll be happy to refund this charge for you. Just let me know once are able to pay for the order.
If you have any other questions, feel free to include them in your reply. Thank you for choosing the iTunes Store. Take care, and have a great day!