The Interest calculation service, at the end of the month will calculate interest owed to that account from the beginning of the month until the account has changed its status to IN CLOSING. In the example above, the last day of the month, we will calculate interest owed from March 1st to March 15 and perform the payout. You will then receives a webhook notification when the payout is performed. After the Payout is performed, you can can transfer the funds to the end-customers external account or any other account, up to the customer. After the Payout, the account has a zero balance and you can now CLOSE the account.