Register a balance for an interest-bearing account using a previously configured interest plan to determine applicable interest rates.

This endpoint generates the Interest balance succeeded event when the balance is created successfully.

The event payload includes: program_id, balance_id, account_id, interest_plan_id, balance, start_cycle_date, value_date, and maturity_date. The optional field external_account_id is included in the event only when present in the request. The division fields division_id and division_code are included in the event only when a non-default division is provided. They are omitted when division_id is DEFAULT_DIVISION or the value is null.

The optional field external_account_id is only returned in the response when present in the request.