Discord Nitro is Discord's paid subscription: it gives larger file uploads, custom emoji on any server, HD streaming and server boosts. Two variants are offered here — full Nitro and the simpler Nitro Basic; the product name tells you which one it is. The subscription is delivered as a gift code and is redeemed in Discord, in the gifts section of the user settings.
After payment the code appears under “Orders” in your account. A delivered code cannot be returned or exchanged. If a code does not work, contact support within 48 hours of receiving it, with a screenshot of the error. You can pay by bank card or from your balance.

