I got no giftcode for the windows 10 edition

you're not supposed to that was only for Java players

i am a java player

The period where Java Edition users who have purchased the game before October 2018 receive a free code for the Windows 10 Edition has officially ended. If you have not claimed the code, you will no longer be able to do so.

Please see this link for official details: https://www.minecraft.net/en-us/article/ancient-java-players--you-attention-please-