You can view your purchase history by following these steps:

On your mobile device (iPhone/iPad):
  • Go to your device Settings > [your name] > iTunes & App Store
  • Tap your Apple ID, then tap View Apple ID
  • Select Purchase History
On your computer:
  • Open iTunes on your computer
  • Click "Account" and log in (or confirm the email address)
  • Click "View my account..."
  • Scroll down to "Purchase History" and click "See All"