When making a Rupiah deposit transaction to BCA Indodax account, users will receive a unique 3-digit number that must be added to the deposit amount. This unique number is not a transaction fee, but is used to facilitate the process of identifying and verifying deposits. With the unique number, the Indodax system can automatically match the incoming deposit with the right user account, thus speeding up the credit process to the account balance. After the deposit is successfully verified, the unique number will be returned to the user's account balance. Therefore, users do not need to worry that the unique number will reduce the amount of funds deposited. This unique number is part of Indodax's efforts to improve efficiency and security in deposit transactions. Users are expected to always add the unique number every time they make a deposit to ensure a smooth and precise process. Thus, Indodax ensures that every transaction can be processed quickly and accurately without any additional fees charged to users.