Promo codes are short strings developers hand out during milestones, holidays and content drops. Redeeming one usually grants in-game currency, a cosmetic item or an XP boost — completely free.
Open the experience, wait for the lobby to load, then look for a codes or redeem button — it is usually tucked in the shop or settings panel. Paste the code exactly as written: most are case sensitive.
Developers retire codes once a promotion ends or an economy rebalance lands. That is why a code list is only useful if somebody keeps checking it — which is exactly what our pipeline does every day.