Lexware Office - Veryfront

At a glance

Availability: Experimental (how to enable).
Auth: API key.
Connection: The key from LEXOFFICE_API_KEY is sent as the Bearer prefixed Authorization header.
Docs: https://developers.lexware.io/docs/

Set these per environment. See Connect an integration.

Variable	Required	Description
`LEXOFFICE_API_KEY`	Yes	Lexware Office (lexoffice) Public API key, created in the Lexware Office app under Add-ons > Public API Docs.

Create a Lexware Office account: Sign up at https://www.lexware.de (Lexware Office, formerly lexoffice). A regular trial account is sufficient for testing the Public API; there is no separate sandbox environment.
Generate an API key: Log in to the Lexware Office app and open https://app.lexware.de/addons/public-api to create your Public API key. Only account administrators can create keys.
Store the key: Set the key as LEXOFFICE_API_KEY. It is sent as a Bearer token in the Authorization header on every request.

Since the rebranding from lexoffice to Lexware, the canonical API gateway is https://api.lexware.io (changed 26 May 2025). The legacy gateway api.lexoffice.io was only kept available until December 2025, so all tools use the new domain.
The API is rate limited to 2 requests per second per client; HTTP 429 is returned when exceeded.
POST /v1/files is a multipart/form-data upload: the binary file goes in the ‘file’ part and the upload type (‘voucher’) in the ‘type’ part.
Invoices created via the API are drafts by default; pass finalize=true to create them with status open. Finalized invoices can no longer be edited freely.
voucherType and voucherStatus are mandatory on the voucherlist endpoint; use ‘any’ to avoid filtering.

Tool	Access	Description
List Vouchers	Read	List and filter bookkeeping vouchers (sales and purchase invoices, credit notes) via the voucherlist, e.g. to find open or overdue invoices
Get Invoice	Read	Retrieve a single invoice with line items, totals, tax conditions, and payment status
Create Invoice	Write	Create a sales invoice. Created as an editable draft by default; set finalize=true to immediately open it
List Contacts	Read	List and filter customers and vendors, e.g. to find the contactId for an invoice
Create Contact	Write	Create a customer or vendor contact for use on invoices and vouchers
Upload Voucher File	Write	Upload a receipt image or invoice file (pdf, jpg, png, xml; max 5 MB) for bookkeeping; returns the file id and the id of the voucher created for it
Download File	Read	Download an uploaded bookkeeping voucher file (receipt/invoice image) as binary data by its file id; Content-Type and Content-Disposition response headers carry the MIME type and suggested filename. For sales voucher documents prefer the document render flow.
Get Invoice Document	Read	Trigger PDF rendering for an invoice and return its documentFileId, which can then be downloaded via Download File. Required for invoices created through the API with status open; draft invoices have no document file and are rejected with 406.
Get Payments	Read	Get the payment status of an invoice or voucher: open amount, paid date, and payment items - the reliable way to check who actually paid

List my open and overdue invoices in Lexware Office and summarize the outstanding amounts.
Create a draft invoice in Lexware Office for a customer; ask me for the line items first.
Upload this receipt to Lexware Office as a bookkeeping voucher.