HT202023: About in-app purchases
Learn about About in-app purchases
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Helpful answers
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Apr 14, 2014 12:19 AM in response to Gus54by King_Penguin,If you want to remove your credit card from your iTunes account then on your computer's iTunes you should be able to edit your payment info by going into the Store > View Account menu option and logging into your account, and on your account's details page there should be a payment link. If you are doing it on your iPhone then tap on your id in Settings > iTunes & App Store and tap 'View Apple ID' on the popup and log into your account- that should also give you a payments link on your account's page.
Changing payment info : http://support.apple.com/kb/HT1918
If you just want to prevent apps being bought/downloaded on your phone then you can hide the App Store via Settings > General > Restrictions > Installing Apps 'off'
Or do you mean something else ?