Built forCS-CartAdd-ons for CS-Cart & Multi-Vendor, from an independent developer

sevDesk Accounting Sync

by Kavio Labs · for CS-Cart & Multi-Vendor

Integrates with sevDesk: invoices, credit notes and payment bookings from your orders, with the right tax rule and a PDF for customers.

Tested on 2 builds Updated Nov 8, 2026 Version 1.0.0 CS-Cart, Multi-Vendor 4.17.2 – 4.21.x No core file edits
Built forCS-Cart

What it does

For online shops in Germany that keep their books in sevDesk. When an order reaches the status you choose, the add-on creates the customer contact and the invoice in your sevDesk account through the sevDesk API, marks it as sent so sevDesk numbers it, and books the payment on the account you pick. Works with CS-Cart, CS-Cart Ultimate, Multi-Vendor and Multi-Vendor Ultimate and the current sevDesk bookkeeping (sevdesk-Update 2.0).

How it works

Paste the API token of a sevDesk trial account, press Test connection, pick the payment account for bookings and run a few test orders; then switch to your live token. Choose the order status that creates the invoice. The add-on picks the tax rule (domestic, intra-community, One Stop Shop when you are registered, export, small business) from the order. A queue with automatic retries does the work in the background; every call is in the log, the token never is.

Features

  • Invoices created at the order status you choose and finalized after a total check (or kept as drafts), with product, shipping and fee lines; the order discount is spread over the products
  • SevDesk tax rules chosen per order: taxable in Germany, intra-community supply or reverse charge for EU companies, One Stop Shop for EU consumers (when registered), export, small business
  • Customer contacts: companies with their VAT ID, consumers as persons, guests once per e-mail address
  • Payments booked on the clearing or cash account you choose, refunds optionally booked as paid out
  • Credit notes from the invoice for the refund status and completed returns, capped at what is left on the invoice
  • Invoice state read back by the cron, with an optional order status change when sevDesk shows it paid
  • Invoice PDF for signed-in customers once the invoice is finalized
  • Built to create each invoice once: records each attempt first, looks it up after a lost answer and asks you when it cannot tell
  • API token stored encrypted, test and live mode, log with CSV export, data kept on uninstall unless you choose to delete it
  • Multi-Vendor: one marketplace account or each vendor connects their own sevDesk account, with strict vendor scope

What you get

Packagekv_sevdesk-1.0.0.zip, installed through Add-ons → Manage add-ons
Updates & support12 months included. Download new versions from your account and install them in Add-ons → Manage add-ons or the Upgrade Center.
License1 production installation. Staging, dev and localhost are free and unlimited. The add-on keeps working after the update period ends. How licensing works
Version
1.0.0
Updated
Nov 8, 2026
CS-Cart
4.17.2 – 4.21.x
Tested on
CS-Cart 4.17.2 Ultimate (HTTP end-to-end with real orders), Multi-Vendor 4.17.2 vendor-panel checks, a local mock built to the official sevDesk OpenAPI document
PHP
7.4 – 8.3
Core edits
None
Add-on ID
kv_sevdesk
Developer
Kavio Labs Software Limited

Support

Policy
Bug reports
1 business day
How-to questions
2 business days
Channel
Tickets in your account

Frequently bought together

Add a released add-on to this order and save 15% on it. It uses the same edition and store domain.

sevDesk Accounting SyncThis add-on
DATEV Export for AccountingExport orders, credit notes and customers as DATEV files for your tax adviser, with SKR03 and SKR04 presets.
$79
Lexware Office ConnectorCreates finalized invoices and credit notes in Lexware Office from your orders, reads payments back and gives customers their invoice PDF.
$69
EU e-Invoicing: XRechnung 2027, Factur-X/ZUGFeRD & Peppol SendingEN 16931 e-invoices from your orders (XRechnung, Factur-X/ZUGFeRD, Peppol BIS 3.0), sent and received over Peppol with your own provider account.
$99

Buy with confidence

What stands behind your license

  • Tested builds

    This product was tested on these builds. Builds we did not test are not listed.

    • CS-Cart4.17.2HTTP end-to-end with real orders
    • Multi-Vendor4.17.2
  • 12 months of updates

    Updates and support are included in the price. The product keeps working afterwards; renewing is optional.

    How licensing works
  • 30-day refund

    If it is not what you expected, tell us within 30 days and we refund the order.

    Refund policy
  • Secure checkout

    Pay by card, Apple Pay or Google Pay on Stripe's secure page. Your card number never reaches our server.

    Ask a pre-sales question

Sold by Kavio Labs Software Limited, registered in England and Wales No. 17532441. About us

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