intraday balance - amend/adapt description

[svenbiellmann]

With regard to the Kaspar& use case on bLink we got and get a lot of questions about what "kind" of balance will be returned by the GET /accounts/{accountId}/balance endpoint when called without a date. The current description seems to be not clear enough.

Proposal would be to adapt the description along the ISO20022 descriptions below.

[ochatelain]

The "BalanceType" according to ISO20022 define the following subtypes. Maybe there is a solution within the other types?

No	Code	Name	Definition
1	CLAV	ClosingAvailable	Closing balance of amount of money that is at the disposal of the account owner on the date specified.
2	CLBD	ClosingBooked	Balance of the account at the end of the pre-agreed account reporting period. It is the sum of the opening booked balance at the beginning of the period and all entries booked to the account during the pre-agreed account reporting period.
3	FWAV	ForwardAvailable	Forward available balance of money that is at the disposal of the account owner on the date specified.
4	INFO	Information	Balance for informational purposes.
5	ITAV	InterimAvailable	Available balance calculated in the course of the account servicer's business day, at the time specified, and subject to further changes during the business day. The interim balance is calculated on the basis of booked credit and debit items during the calculation time/period specified.
6	ITBD	InterimBooked	Balance calculated in the course of the account servicer's business day, at the time specified, and subject to further changes during the business day. The interim balance is calculated on the basis of booked credit and debit items during the calculation time/period specified.
7	OPAV	OpeningAvailable	Opening balance of amount of money that is at the disposal of the account owner on the date specified.
8	OPBD	OpeningBooked	Book balance of the account at the beginning of the account reporting period. It always equals the closing book balance from the previous report.
9	PRCD	PreviouslyClosedBooked	Balance of the account at the previously closed account reporting period. The opening booked balance for the new period has to be equal to this balance. Usage: the previously booked closing balance should equal (inclusive date) the booked closing balance of the date it references and equal the actual booked opening balance of the current date.
10	XPCD	Expected	Balance, composed of booked entries and pending items known at the time of calculation, which projects the end of day balance if everything is booked on the account and no other entry is posted.

[svenbiellmann]

Here is the excerpt from the Swiss Business Rules SPS:

[RaulGuirao]

ZKB delivers the ITBD (interim booked) balance for the current day when it is called without no date (in line with the API specs).

[svenbiellmann]

Meeting Notes 4.4.24

It was agreed to align the current description to definition of ITBD according to ISO 20022.

The pull request will be prepared and discussed on next meeting.

It was stated that in case that a service provider is not able to provide ITBD for a specific day (e.g. weekend, holiday) the response code 204 has to be returned.