accounted/skills/accounted-api/SKILL.md

name, description

name

description

accounted-api

Consume the Accounted REST API (Swedish double-entry bookkeeping SaaS, https://app.gnubok.se/api/v1). Use when building an integration, app, backend job, or agent tool layer against Accounted: invoices, customers, suppliers, supplier invoices, journal entries (bokföring), bank transactions and reconciliation, payroll (lön), VAT/moms and financial reports, SIE import/export, documents, webhooks. Covers auth with gnubok_sk_ API keys, conventions (dry-run, idempotency, cursor pagination, scopes), and all 124 endpoints.

Accounted API integration

Accounted is Swedish double-entry bookkeeping (bokföring) as a service: BAS chart of accounts, verifikationer with legally immutable audit trails, VAT (moms), payroll (lön), invoicing, bank reconciliation, and statutory reports, exposed as a REST API designed for agents and integrations first.

This skill is for building software against the REST API (an app, a backend job, an agent tool layer). If the goal is to operate a ledger conversationally (book receipts, run month close), use the Accounted MCP connector and its workflow skills instead: install the accounted plugin or see https://app.gnubok.se/docs/api/connect-claude.

If you have used Stripe's API the shape will feel familiar: bearer keys, dated versions, idempotency keys, webhook signatures, cursor pagination. The domain rules are Swedish accounting law; the Gotchas section below stops the classic violations before you ship them.

Auth and base URL

Every request sends a bearer key:

curl https://app.gnubok.se/api/v1/companies \
  -H "Authorization: Bearer gnubok_sk_live_..."

• Base URL: https://app.gnubok.se/api/v1 (legacy machine host, permanent). https://app.accounted.se/api/v1 serves the identical API.
• Keys are created in the Accounted dashboard under Settings -> API (/settings/api). Two prefixes:
  • gnubok_sk_live_* commits real writes.
  • gnubok_sk_test_* reads real company data but forces every write into dry-run (responses carry X-Gnubok-Mode: test). Develop and run evals with a test key; switch to live last.
• Each key carries scopes (invoices:read, invoices:write, payroll:write, webhooks:manage, ...). Every endpoint in the index below is annotated with its required scope; a missing scope returns 403.
• Rate limit: 100 requests/minute per key. On 429, honor Retry-After.
• URLs carry the company id explicitly (/api/v1/companies/{companyId}/invoices). A key can act on any company its user is a member of; start every session with GET /api/v1/companies to discover ids. There is no implicit "current company".

First calls, in order: GET /api/v1/health (no auth, connectivity), then GET /api/v1/companies (auth works, discover companyId).

Conventions

These rules hold across the whole surface; endpoint entries below do not repeat them.

Response envelope. Success: { "data": ..., "meta": { "request_id", "api_version", "next_cursor"?, "audit"?, "partial_expansions"? } }. Errors replace data with error (no meta; request_id moves inside error).

Errors. Stable machine codes with agent-oriented remediation:

{ "error": { "code": "PERIOD_LOCKED", "message": "Svenska", "message_en": "English",
  "details": {}, "recovery_hint": "next step", "docs_url": "...",
  "valid_alternatives": {}, "request_id": "req_..." } }

React to code, read message_en and recovery_hint, follow valid_alternatives when present (e.g. next_open_period). Standard codes on every endpoint: 400 validation, 401 bad key, 403 missing scope, 404, 429 rate limited (honor Retry-After), 500. Full catalogue: https://app.gnubok.se/docs/api/errors. Only endpoint-specific codes are mentioned per endpoint below.

Cursor pagination. List endpoints take ?cursor= and return meta.next_cursor; loop until it is absent/null. A stale or tampered cursor is NOT an error: the first page is returned again, so terminate on next_cursor, never on "page looks familiar".

Dry-run on every write that supports it (dry-run badge in the index). Send ?dry_run=true (or X-Dry-Run: true): the response is always 200 with data.dry_run: true plus a preview (would-be record, journal lines, voucher number) and the X-Dry-Run: true response header; nothing is committed. Commit by re-issuing without the flag and with the SAME Idempotency-Key (the dry run is not cached against the key). Preview first on any financial write; it is free.

Idempotency-Key. Send a fresh UUID header on every POST/PATCH/DELETE; several endpoints reject writes without one (400). Replaying the same key+body returns the original response with the Idempotent-Replayed: true header; the same key with a different body returns 409 IDEMPOTENCY_KEY_REUSE (24h window). Safe retry loop: keep the key, keep the body.

Test keys are simulation-only. With a gnubok_sk_test_* key, reads return real company data (responses carry X-Gnubok-Mode: test) and every write is forced into dry-run; writes that cannot be simulated return 403 TEST_KEY_WRITE_BLOCKED. Nothing a test key does ever persists: it is ?dry_run=true baked into the credential. Full end-to-end write tests therefore need a live key against a company you own.

Atomic writes. A mutation either commits fully or errors with no side effects. There is no partial state to clean up after an error response (bulk-create endpoints that do partial success say so explicitly).

Audit inline. Successful financial writes include meta.audit (voucher number, audit-trail URL, immutability timestamp). No follow-up read needed to confirm what was booked.

Expansion. Some list/detail endpoints take ?expand=a,b (documented per endpoint). If an expansion fails the response still succeeds and names the failed parts in meta.partial_expansions; check it before trusting expanded fields.

Async operations. Long-running actions (fiscal-period lock/close/year-end, imports) return 202 with an operation id; poll GET /api/v1/operations/{id} until status is succeeded/failed. The response shape is identical whether the work ran inline or queued.

Versioning. Dated versions (current: see meta.api_version). Pin with the Gnubok-Version request header; responses echo it. Additive changes ship without a version bump; see https://app.gnubok.se/docs/api/versioning.

Index badges. Every operation line below carries machine-readable annotations from the spec: scope: (required key scope), risk: (low/medium/ high; confirm with a human before unprompted high-risk calls), idempotent (safe to retry), dry-run (previewable), reversible (a single follow-up call can undo it, e.g. invoice credit).

Endpoint index

API version 2026-05-12, 124 operations. Paths are shown without their /api/v1 prefix (full base URL: https://app.gnubok.se/api/v1).

Core (4)

Full detail: references/core.md

GET /companies : List companies the API key can access [scope:companies:read risk:low idempotent]
PATCH /companies/{companyId}/settings : Partially update company settings [scope:companies:write risk:medium idempotent dry-run reversible]
GET /health : Health check [risk:low idempotent]
GET /operations/{id} : Poll a long-running operation by id [scope:operations:read risk:low idempotent]

Journal entries (8)

Full detail: references/journal-entries.md

GET /companies/{companyId}/journal-entries : List journal entries (verifikationer) [scope:reports:read risk:low idempotent]
POST /companies/{companyId}/journal-entries : Create a draft journal entry (verifikation) [scope:bookkeeping:write risk:high idempotent dry-run reversible]
GET /companies/{companyId}/journal-entries/{id} : Retrieve a single verifikation by id [scope:reports:read risk:low idempotent]
POST /companies/{companyId}/journal-entries/{id}/commit : Commit a draft journal entry [scope:bookkeeping:write risk:high idempotent dry-run reversible]
POST /companies/{companyId}/journal-entries/{id}/correct : Correct a posted journal entry (BFL 5:5 storno-then-replace) [scope:bookkeeping:write risk:high idempotent dry-run]
POST /companies/{companyId}/journal-entries/{id}/reverse : Storno a posted journal entry [scope:bookkeeping:write risk:high idempotent dry-run]
POST /companies/{companyId}/journal-entries/batch-create : Create up to 50 draft journal entries (partial-success) [scope:bookkeeping:write risk:high idempotent dry-run reversible]
POST /companies/{companyId}/voucher-gap-explanations : Document a gap in the verifikationsserie (BFL 5 kap 6-7 §§) [scope:bookkeeping:write risk:low idempotent dry-run]

Periods and registers (12)

Full detail: references/periods.md

GET /companies/{companyId}/accounts : List chart-of-accounts entries (BAS chart) [scope:reports:read risk:low idempotent]
GET /companies/{companyId}/compliance/check : Run a structured compliance pre-flight check [scope:compliance:read risk:low idempotent]
GET /companies/{companyId}/dimensions : List dimensions (kostnadsställe/projekt) with their values [scope:reports:read risk:low idempotent]
POST /companies/{companyId}/dimensions/{id}/values : Create a dimension value (kostnadsställe/projekt code) [scope:bookkeeping:write risk:low idempotent dry-run reversible]
PATCH /companies/{companyId}/dimensions/{id}/values/{valueId} : Update a dimension value (rename, archive, set start/end date) [scope:bookkeeping:write risk:low idempotent dry-run reversible]
DELETE /companies/{companyId}/dimensions/{id}/values/{valueId} : Delete an unreferenced dimension value [scope:bookkeeping:write risk:medium idempotent]
GET /companies/{companyId}/fiscal-periods : List fiscal periods (räkenskapsår) [scope:reports:read risk:low idempotent]
POST /companies/{companyId}/fiscal-periods/{id}/close : Close a fiscal period (IRREVERSIBLE per BFL 5 kap 8 §) [scope:bookkeeping:write risk:high idempotent]
POST /companies/{companyId}/fiscal-periods/{id}/currency-revaluation : Run FX revaluation for the fiscal period [scope:bookkeeping:write risk:high idempotent reversible]
POST /companies/{companyId}/fiscal-periods/{id}/lock : Lock a fiscal period (no new entries can be posted into it) [scope:bookkeeping:write risk:high idempotent reversible]
POST /companies/{companyId}/fiscal-periods/{id}/opening-balances : Generate opening-balance verifikation for the next fiscal period [scope:bookkeeping:write risk:high idempotent reversible]
POST /companies/{companyId}/fiscal-periods/{id}/year-end : Execute year-end closing (currency revaluation + closing entry) [scope:bookkeeping:write risk:high idempotent]

Invoices (AR) (10)

Full detail: references/invoices.md

GET /companies/{companyId}/invoices : List invoices for a company [scope:invoices:read risk:low idempotent]
POST /companies/{companyId}/invoices : Create a draft invoice, proforma, or delivery note [scope:invoices:write risk:medium idempotent dry-run reversible]
GET /companies/{companyId}/invoices/{id} : Retrieve a single invoice by id [scope:invoices:read risk:low idempotent]
PATCH /companies/{companyId}/invoices/{id} : Update a draft invoice (metadata fields, optionally replacing line items) [scope:invoices:write risk:low idempotent dry-run reversible]
POST /companies/{companyId}/invoices/{id}/credit : Issue a credit note (kreditfaktura) against an invoice [scope:invoices:write risk:high idempotent dry-run]
POST /companies/{companyId}/invoices/{id}/mark-paid : Record a payment against an invoice [scope:invoices:write risk:medium idempotent dry-run]
POST /companies/{companyId}/invoices/{id}/mark-sent : Transition a draft invoice to sent (without emailing) [scope:invoices:write risk:medium idempotent dry-run]
GET /companies/{companyId}/invoices/{id}/pdf : Download the rendered invoice PDF [scope:invoices:read risk:low idempotent]
POST /companies/{companyId}/invoices/{id}/send : Send a draft invoice to the customer by email [scope:invoices:write risk:high idempotent dry-run]
POST /companies/{companyId}/invoices/bulk-create : Create up to 50 draft invoices in one call (partial-success) [scope:invoices:write risk:medium idempotent dry-run reversible]

Customers and articles (7)

Full detail: references/customers.md

GET /companies/{companyId}/articles : List the article register (artikelregister) [scope:invoices:read risk:low idempotent]
GET /companies/{companyId}/customers : List customers for a company [scope:customers:read risk:low idempotent]
POST /companies/{companyId}/customers : Create a customer [scope:customers:write risk:low idempotent dry-run reversible]
GET /companies/{companyId}/customers/{id} : Retrieve a single customer by id [scope:customers:read risk:low idempotent]
PATCH /companies/{companyId}/customers/{id} : Partially update a customer [scope:customers:write risk:low idempotent dry-run reversible]
DELETE /companies/{companyId}/customers/{id} : Archive a customer (soft-delete) [scope:customers:write risk:medium idempotent dry-run reversible]
POST /companies/{companyId}/customers/bulk-create : Create up to 50 customers in one call (partial-success) [scope:customers:write risk:low idempotent dry-run reversible]

Suppliers (AP) (13)

Full detail: references/suppliers.md

GET /companies/{companyId}/supplier-invoices : List supplier invoices for a company [scope:suppliers:read risk:low idempotent]
POST /companies/{companyId}/supplier-invoices : Register a new supplier invoice [scope:suppliers:write risk:medium idempotent dry-run reversible]
GET /companies/{companyId}/supplier-invoices/{id} : Retrieve a single supplier invoice by id [scope:suppliers:read risk:low idempotent]
PATCH /companies/{companyId}/supplier-invoices/{id} : Update a registered supplier invoice [scope:suppliers:write risk:low idempotent dry-run reversible]
POST /companies/{companyId}/supplier-invoices/{id}/approve : Approve a registered or overdue supplier invoice [scope:suppliers:write risk:low idempotent dry-run]
POST /companies/{companyId}/supplier-invoices/{id}/credit : Issue a credit note for a supplier invoice [scope:suppliers:write risk:high idempotent dry-run]
POST /companies/{companyId}/supplier-invoices/{id}/mark-paid : Record a payment against a supplier invoice [scope:suppliers:write risk:medium idempotent dry-run]
GET /companies/{companyId}/suppliers : List suppliers for a company [scope:suppliers:read risk:low idempotent]
POST /companies/{companyId}/suppliers : Create a supplier [scope:suppliers:write risk:low idempotent dry-run reversible]
GET /companies/{companyId}/suppliers/{id} : Retrieve a single supplier by id [scope:suppliers:read risk:low idempotent]
PATCH /companies/{companyId}/suppliers/{id} : Partially update a supplier [scope:suppliers:write risk:low idempotent dry-run reversible]
DELETE /companies/{companyId}/suppliers/{id} : Archive a supplier (soft-delete) [scope:suppliers:write risk:medium idempotent dry-run reversible]
POST /companies/{companyId}/suppliers/bulk-create : Create up to 50 suppliers in one call (partial-success) [scope:suppliers:write risk:low idempotent dry-run reversible]

Documents (4)

Full detail: references/documents.md

POST /companies/{companyId}/documents : Upload a document to the WORM archive [scope:documents:write risk:medium idempotent]
GET /companies/{companyId}/documents/{id}/download : Get a time-limited signed download URL for a document [scope:documents:read risk:low idempotent]
POST /companies/{companyId}/documents/{id}/link : Link a document to a journal entry [scope:documents:write risk:medium idempotent dry-run]
POST /companies/{companyId}/inbox-items/{id}/stamp : Mark an inbox item as consumed by a journal entry [scope:documents:write risk:low idempotent]

Banking (12)

Full detail: references/banking.md

POST /companies/{companyId}/imports/bank : Import a bank-file (CSV / XML / CAMT053) [scope:transactions:write risk:medium idempotent]
POST /companies/{companyId}/imports/sie : Import a SIE4 file [scope:bookkeeping:write risk:high idempotent]
POST /companies/{companyId}/reconciliation/bank/run : Run the bank-reconciliation matcher [scope:transactions:write risk:medium idempotent dry-run]
GET /companies/{companyId}/reconciliation/bank/status : Bank-reconciliation health snapshot [scope:transactions:read risk:low idempotent]
GET /companies/{companyId}/transactions : List transactions for a company [scope:transactions:read risk:low idempotent]
GET /companies/{companyId}/transactions/{id} : Retrieve a single transaction by id [scope:transactions:read risk:low idempotent]
POST /companies/{companyId}/transactions/{id}/categorize : Categorize a transaction and create the journal entry [scope:transactions:write risk:medium idempotent dry-run reversible]
POST /companies/{companyId}/transactions/{id}/match-invoice : Match a positive bank transaction to a customer invoice [scope:transactions:write risk:high idempotent]
POST /companies/{companyId}/transactions/{id}/match-supplier-invoice : Match a negative bank transaction to a supplier invoice [scope:transactions:write risk:high idempotent]
POST /companies/{companyId}/transactions/{id}/uncategorize : Reverse the categorization of a transaction (storno + reset) [scope:transactions:write risk:medium idempotent dry-run]
POST /companies/{companyId}/transactions/batch-categorize : Categorize up to 100 transactions in one call (partial-success) [scope:transactions:write risk:medium idempotent dry-run reversible]
POST /companies/{companyId}/transactions/ingest : Bulk-ingest transactions (up to 500 per call) [scope:transactions:write risk:medium idempotent dry-run]

Employees (13)

Full detail: references/employees.md

GET /companies/{companyId}/employees : List employees for a company [scope:payroll:read risk:low idempotent]
POST /companies/{companyId}/employees : Create an employee [scope:payroll:write risk:low idempotent dry-run reversible]
GET /companies/{companyId}/employees/{id} : Get a single employee [scope:payroll:read risk:low idempotent]
PATCH /companies/{companyId}/employees/{id} : Update an employee [scope:payroll:write risk:low idempotent dry-run]
DELETE /companies/{companyId}/employees/{id} : Soft-delete an employee [scope:payroll:write risk:low idempotent dry-run reversible]
GET /companies/{companyId}/employees/{id}/absence : List absence days for an employee in a date range [scope:payroll:read risk:low idempotent]
PUT /companies/{companyId}/employees/{id}/absence : Register absence for an employee over a date range [scope:payroll:write risk:low idempotent dry-run reversible]
DELETE /companies/{companyId}/employees/{id}/absence : Delete absence days for an employee in a date range [scope:payroll:write risk:low idempotent dry-run]
GET /companies/{companyId}/employees/{id}/opening-balances : Get an employee's payroll cutover opening balances [scope:payroll:read risk:low idempotent]
PUT /companies/{companyId}/employees/{id}/opening-balances : Set an employee's payroll cutover opening balances [scope:payroll:write risk:medium idempotent dry-run reversible]
GET /companies/{companyId}/employees/{id}/vacation-balance : Get an employee's current vacation balance [scope:payroll:read risk:low idempotent]
PUT /companies/{companyId}/employees/opening-balances : Bulk-set payroll cutover opening balances (atomic) [scope:payroll:write risk:medium idempotent dry-run reversible]
POST /companies/{companyId}/salary/vacation-year-close : Close a vacation year (semesterberedning + arsavslut) [scope:payroll:write risk:high idempotent dry-run]

Salary runs (18)

Full detail: references/salary-runs.md

GET /companies/{companyId}/salary-runs : List salary runs [scope:payroll:read risk:low idempotent]
POST /companies/{companyId}/salary-runs : Create a salary run [scope:payroll:write risk:low idempotent dry-run reversible]
GET /companies/{companyId}/salary-runs/{id} : Get a salary run [scope:payroll:read risk:low idempotent]
PATCH /companies/{companyId}/salary-runs/{id} : Update a draft salary run [scope:payroll:write risk:low idempotent dry-run]
DELETE /companies/{companyId}/salary-runs/{id} : Delete a draft salary run [scope:payroll:write risk:low idempotent dry-run]
POST /companies/{companyId}/salary-runs/{id}/approve : Approve a reviewed salary run [scope:payroll:write risk:low idempotent dry-run]
POST /companies/{companyId}/salary-runs/{id}/book : Post the verifikationer for a paid salary run [scope:payroll:write risk:high idempotent dry-run]
POST /companies/{companyId}/salary-runs/{id}/calculate : Calculate a draft salary run and advance it to review [scope:payroll:write risk:medium idempotent dry-run]
GET /companies/{companyId}/salary-runs/{id}/employees : List per-employee results of a salary run [scope:payroll:read risk:low idempotent]
POST /companies/{companyId}/salary-runs/{id}/employees : Add an employee to a draft salary run [scope:payroll:write risk:low idempotent dry-run reversible]
GET /companies/{companyId}/salary-runs/{id}/employees/{employeeId} : Get one employee's payslip in a salary run [scope:payroll:read risk:low idempotent]
DELETE /companies/{companyId}/salary-runs/{id}/employees/{employeeId} : Remove an employee from a draft salary run [scope:payroll:write risk:low idempotent dry-run reversible]
POST /companies/{companyId}/salary-runs/{id}/employees/{employeeId}/lines : Add a payslip line to an employee in a draft salary run [scope:payroll:write risk:low idempotent dry-run reversible]
POST /companies/{companyId}/salary-runs/{id}/generate-agi : Generate the Skatteverket AGI XML for a salary run [scope:payroll:write risk:medium idempotent]
PATCH /companies/{companyId}/salary-runs/{id}/lines/{lineId} : Update a payslip line in a draft salary run [scope:payroll:write risk:low idempotent dry-run reversible]
DELETE /companies/{companyId}/salary-runs/{id}/lines/{lineId} : Delete a payslip line from a draft salary run [scope:payroll:write risk:low idempotent dry-run]
POST /companies/{companyId}/salary-runs/{id}/mark-paid : Mark an approved salary run as paid [scope:payroll:write risk:low idempotent dry-run]
GET /companies/{companyId}/salary-runs/{id}/payslips/{employeeId}/pdf : Download one employee's payslip as PDF [scope:payroll:read risk:low idempotent]

Reports (14)

Full detail: references/reports.md

GET /companies/{companyId}/reports/ar-ledger : AR ledger: unpaid customer invoices with aging [scope:reports:read risk:low idempotent]
GET /companies/{companyId}/reports/avgifter-basis : Annual arbetsgivaravgifter basis per employee [scope:payroll:read risk:low idempotent]
GET /companies/{companyId}/reports/balance-sheet : Balance sheet (balansräkning) for a fiscal period [scope:reports:read risk:low idempotent]
GET /companies/{companyId}/reports/continuity-check : IB/UB continuity check: opening balances match prior closing [scope:reports:read risk:low idempotent]
GET /companies/{companyId}/reports/general-ledger : General ledger (huvudbok) for a fiscal period [scope:reports:read risk:low idempotent]
GET /companies/{companyId}/reports/income-statement : Income statement (resultatrapport) for a fiscal period [scope:reports:read risk:low idempotent]
GET /companies/{companyId}/reports/journal-register : Journal register (verifikationsregister) for a fiscal period [scope:reports:read risk:low idempotent]
GET /companies/{companyId}/reports/monthly-breakdown : Income statement broken down by month for a fiscal period [scope:reports:read risk:low idempotent]
GET /companies/{companyId}/reports/salary-journal : Salary journal (lönejournal) for a year and optional month range [scope:payroll:read risk:low idempotent]
GET /companies/{companyId}/reports/sie-export : SIE4 export (.se file) for a fiscal period [scope:reports:read risk:low idempotent]
GET /companies/{companyId}/reports/supplier-ledger : Supplier ledger: unpaid supplier invoices with aging [scope:reports:read risk:low idempotent]
GET /companies/{companyId}/reports/trial-balance : Trial balance (huvudboksrapport) for a fiscal period [scope:reports:read risk:low idempotent]
GET /companies/{companyId}/reports/vacation-liability : Vacation liability (semesterlöneskuld) per employee at year-end [scope:payroll:read risk:low idempotent]
GET /companies/{companyId}/reports/vat-declaration : Swedish VAT declaration (momsdeklaration) for a period [scope:reports:read risk:low idempotent]

Webhooks (9)

Full detail: references/webhooks.md

GET /companies/{companyId}/webhooks : List webhook subscriptions for a company [scope:webhooks:manage risk:low idempotent]
POST /companies/{companyId}/webhooks : Register a webhook subscription [scope:webhooks:manage risk:low idempotent dry-run reversible]
GET /companies/{companyId}/webhooks/{id} : Get a webhook subscription by id [scope:webhooks:manage risk:low idempotent]
PATCH /companies/{companyId}/webhooks/{id} : Update a webhook subscription [scope:webhooks:manage risk:low idempotent dry-run reversible]
DELETE /companies/{companyId}/webhooks/{id} : Delete a webhook subscription [scope:webhooks:manage risk:medium idempotent]
GET /companies/{companyId}/webhooks/{id}/deliveries : List deliveries for a webhook subscription [scope:webhooks:manage risk:low idempotent]
POST /companies/{companyId}/webhooks/{id}/rotate-secret : Rotate the HMAC signing secret on a webhook [scope:webhooks:manage risk:medium]
POST /companies/{companyId}/webhooks/{id}/test : Send a synthetic test event to a webhook [scope:webhooks:manage risk:low]
POST /webhook-deliveries/{id}/retry : Retry a webhook delivery [scope:webhooks:manage risk:medium]

Gotchas (Swedish accounting domain)

Rules a generic REST integration will violate unless told:

• Account numbers are strings, not numbers. BAS accounts ("1930", "3001") are identifiers; send them as JSON strings. Arithmetic on them, zero-stripping, or number coercion corrupts postings.
• Posted journal entries are immutable by law (Bokföringslagen). There is no PATCH or DELETE on a committed entry, ever. Undo with POST .../journal-entries/{id}/reverse (storno), fix with POST .../journal-entries/{id}/correct. Design flows around reverse-and-repost, not edit-in-place.
• Voucher numbers are gapless and server-assigned. Never assume or pre-allocate one; read it from meta.audit.voucher_number after commit. A legally required gap explanation goes through POST .../voucher-gap-explanations.
• Every entry balances. sum(debit) === sum(credit) to the öre, amounts are decimal SEK numbers (max 2 decimals). Do rounding with round-half-away-from-zero on öre; never float-accumulate line totals client-side and "fix" the difference on a random line.
• Period locks are a feature, not an error to retry. Writes into a locked/closed period return PERIOD_LOCKED (with valid_alternatives pointing at open periods). Retrying the same request cannot succeed; either target an open period or surface the lock to the user.
• Drafts vs posted. Invoices are created as drafts with invoice_number: null; the F-series number is assigned atomically on send. Journal entries follow draft -> commit. Nothing financial exists in the ledger until the commit/send action.
• Two invoice worlds. invoices = accounts receivable (you bill customers); supplier-invoices = accounts payable (you receive bills). They are different resources with different lifecycles.
• Swedish user-facing text. error.message is Swedish by design; show it to Swedish end users, and use message_en for your own logs/logic. Domain terms in responses (moms, verifikat, kostnadsställe) are not translatable labels but legal concepts.
• Compliance pre-flight. Before building your own validation for Swedish rules, call GET .../compliance/check: it runs the server's own rule set (VAT plausibility, sequence integrity, period status) and returns findings.

Verification

This skill is generated (npm run apiskill:generate in the Accounted repo) from the same endpoint registry that serves the live API, its OpenAPI spec (https://app.gnubok.se/api/v1/openapi.json), and its runtime request validators, so schema drift between this text and the server cannot occur for a matching api_version. CI regenerates and diffs it on every change.

Before first use in a new environment, smoke-test:

curl -s https://app.gnubok.se/api/v1/health
curl -s https://app.gnubok.se/api/v1/companies -H "Authorization: Bearer $ACCOUNTED_API_KEY"

If meta.api_version in responses is newer than the version in this skill's index header, refetch the skill (or read the changelog at https://app.gnubok.se/docs/api/changelog) before relying on endpoint details.