Watermark – CamWow Retro: Vintage photo booth effects live on camera! Review

I recently got a new iPod touch, on my other iPod I had cam wow as well and paid for the watermark to disappear. Now on this iPod I logged back in with the same username and all but the watermark is still here... Why..? I already paid for it once why should I pay for it again. I love the app and would like to continue using it. Is this possible to fix? If so please let me know.
Review by Marina2098 on CamWow Retro: Vintage photo booth effects live on camera!.