Since I linked a €50 app voucher to my Apple ID, it's impossible to purchase apps.
I have got this voucher and also a credit card linked to my account, but the App Store still prevents my to purchase apps.
Here is a screenshot:
Thanks in advance.
MacBook Pro with Retina display, OS X Mavericks (10.9.2)
Disable anti virus softwrare if installed
Make sure the firewall is turned off in System Preferences > Security & Privacy > Firewall
Make sure Gatekeeper is enabled
Open System Preferences > Security & Privacy then select the General tab.
Make sure either Mac App Store or Mac App Store and identified developers is selected. If that area is grayed out, click the padlock icon to proceed.
Could not purchase OSX app
