SA7V2DRZGAU5 = 100 Primogems and 10 Mystic Enhancement Ores
PSNVJURZZSD9 = 100 Primogems and 5 Hero's Wits
5SPDKV8ZHBFV = 100 Primogems and 50000 Mora
Last time, the codes were valid for less than 15 hours.
You have to be at least Adventure Rank 10 (reachable in a few hours for new players) .
To redeem the codes:
https://genshin.mihoyo.com/en/gift
or directly in-game by going to Settings->Account->Redeem .