List the book's chart of accounts. Optional search matches a substring of the account name, or the start of the account number.

List fiscal years, showing which is current and which have been confirmed. Nothing can be written into a confirmed year.

Find a partner by name, business id or IBAN.

List vouchers in a date range. Shows ledger vouchers unless a state is given.

Get one voucher with all its entries and attachment names.

Which expense accounts this supplier's earlier bills were booked to, most used first. Empty for a supplier with no history. Call this before add_purchase_invoice so a recurring supplier keeps landing on the same account instead of a guess.

Create a purchase invoice as a DRAFT. It does not enter the ledger and gets no voucher number until a human reviews and approves it in Kitsas; this tool can never book money on its own. Expense lines are debited; the total is credited to the bank account unless credit_account says otherwise. Call suggest_account first so the supplier keeps landing on the same account it always has.

Delete a voucher that is not yet in the ledger. That includes drafts Kitsas itself created, such as a document waiting in its inbox or a draft someone is still working on, not only drafts this server wrote. Refuses any voucher that has already reached the ledger.

The book's balance on the bank account as of a date, for checking against a bank statement.

Every ledger entry on the bank account in a date range, with a running balance, for reconciling against a statement.