Don’t worry, it will happen immediately! Once the friend you invited has successfully completed their registration with the payzy app, within the time frame of the promo (see here), you will receive 5€ in your payzy wallet and your friend will receive the 500 Coins they are entitled to in the "Coins" section, which are worth 5€. Your friend can redeem the Coins in their payzy wallet and do whatever they want with them, without any restriction whatsoever!