Cannot make in app purchase

Hello xuping,

Thanks for using Apple Support Communities. It sounds like you’re having trouble making in-app purchases. We’re happy to help.

While the title of the article below may not seem to pertain to your issue, these are good steps to try for any error messages you may be receiving when trying to make a purchase:

If your payment method is declined in the App Store or iTunes Store - Apple Support

Should the issue persist, contact Apple Support.

Take care.