Arvan Evaluation Test

• Assume a system that includes two wallet services and a discount code.
• Wallet system: it is responsible for maintaining information about the inventory of the user's account and transactions.
• Discount system: manages discount codes and gift charging codes.
• The final of the Iranian national team against Brazil is being broadcast, between the two halves we announce a gift charging code and add a million tomans of gift credit to the first 1,000 people who enter the gift Charging Wallet.
• Reports of users who received gift charging should be available instantly. The user can see their wallet inventory.