You can check your purchase history by:

[Google Play]
1. Login to Google Play
2. Go to "Account"
3. "Orders"

[Galaxy Apps]
1. Run "Galaxy Apps" from your mobile device
2. Select "My Apps" on the top right corner of the screen
3. You can view from your receipts

[App Store]
1. Login to iTunes
2. Click "Account" -> "View my account"
3. Right click and select see all purchase history