How To: Cancel inApp purchases on iPad

You must first try to find out what app is causing the constant purchase message.  Then you try the following steps:

If you've purchased an auto-renewing subscription from an iOS app,  it will be listed under the Manage App Subscriptions section of your Account Information Screen. 

  1. From your device's Home screen, tap App Store.
  2. Tap Featured at the bottom of the screen.
  3. Scroll to the bottom of the page.
  4. Tap the Apple ID button in the lower-left corner. (If you are not signed in, tap the Sign In button, and sign in with your Apple ID. Then, scroll back to the bottom of the page, and tap the Apple ID button.)
  5. Tap the View Apple ID button.
  6. Enter your password and tap OK.
  7. From the main account page, scroll down and tap Manage App Subscriptions.
  8. From the Manage App Subscription page on your iPhone, iPad, or iPod, tap the app name.