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It is necessary to develop a subsystem of calculation of the profit in a specific currency for payments that go into the COMPLETED state. Every time the payment goes into the COMPLETED state, the profit subsystem responds by keeping the current balance for each account created. For the implementation, you can use the free currency rate, at the judgment of the author of the subsystem. Accounts can be managed using the API:Open an account for a particular currency (from this point the account is active and the balance sheet is added to profit).Review the balance sheet for a particular account.Closing the account (after that balance sheet is not changed)Review the rate for the currency pair.The profit is 5% of the amount of COMPLETED payment.
── donations ──payment
