I bought Minecraft Java Edition Card from a convenience store not too long ago, and I bought Minecraft. I only logged in with a Microsoft account. There was no separate receipt after the purchase. After purchasing it, I installed the launcher and ran it, but I could only play the demo version. So when I went back to the site and checked again, there was no purchase button, but there was only an install button with the phrase "install again."

Of course, if I pressed the Install button and reinstalled, I could only paly the demo version.
How can I fix this?