Retrieves a paginated list of transactions on accounts owned by every member of the caller's auth group, optionally filtered to a single member via clientId. A transaction that touches more than one currency account is returned as one row per currency account touched, so the same transactionId can repeat; the identity of a row is the pair (transactionId, currencyAccountId). date is the value date of the transaction, not when it was recorded (that is createdAt); date, and the dateFrom/dateTo filters, are the UK (Europe/London) business date, not a UTC timestamp. amountInMinorUnits, and the amountFrom/amountTo filters, are unsigned magnitudes in minor units — the sign of the movement is carried separately by direction.