You can click on the codes to go to filled-in redeem page, or go to https://genshin.hoyoverse.com/en/gift Note: You need to be Adventure Rank 10 or above to redeem codes.
3B6RYY7AHX9D - 100 Primogems and 10 Mystic Enhancement Ore
JT78YH7SGWRZ - 100 Primogems and 5 Hero's Wit
2BP9HY6BYFR5 - 100 Primogems and 50000 Mora