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 buildsUpdated Nov 8, 2026Version 1.0.0CS-Cart, Multi-Vendor 4.17.2 – 4.21.x No core file edits
Built for
sevDesk Accounting Sync: Invoices with the right tax rule, payment bookings and credit notes in sevDesk from every order1 of 7
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
Package
kv_sevdesk-1.0.0.zip, installed through Add-ons → Manage add-ons
Updates & support
12 months included. Download new versions from your account and install them in Add-ons → Manage add-ons or the Upgrade Center.
License
1 production installation. Staging, dev and localhost are free and unlimited. The add-on keeps working after the update period ends. How licensing works
Compatibility
We list only the builds we install and test on. “Tested” means the full test plan was run on that build; “Supported” means the build is inside the supported range and uses the same hooks.
CS-Cart version and edition compatibility
CS-Cart version
CS-Cart
CS-Cart Ultimate
Multi-Vendor
Multi-Vendor Ultimate
4.22 and later
Testing next
Testing next
Testing next
Testing next
4.21.2
Supported
Supported
Supported
Supported
4.20.x
Supported
Supported
Supported
Supported
4.19.x
Supported
Supported
Supported
Supported
4.18.x
Supported
Supported
Supported
Supported
4.17.2
Supported
Supported
Tested
Supported
Before 4.17.2
Not supported
Not supported
Not supported
Not supported
Last tested build: Multi-Vendor 4.17.2, Nov 8, 2026Tested on: Multi-Vendor 4.17.2
Requirements
PHP
CS-Cart or Multi-Vendor 4.17.2 to 4.21.x, PHP 7.4 to 8.3 with cURL and OpenSSL
Requirement
A sevDesk account (any plan with API access) and its API token: in sevDesk open your user settings; the token is a 32 character code. For tests use a free sevDesk trial account
Requirement
A cron job (recommended) so the queue runs every few minutes
Core changes
None. Hooks and template overrides only
1.0.0
Nov 8, 2026
Latest
Added 11
Invoices in sevDesk from orders at the status you choose: draft created, its total checked against the order, then finalized (marked as sent) so sevDesk numbers it; optional e-mail from sevDesk and enshrining.
sevDesk tax rules per order (sevdesk-Update 2.0): 1 taxable, 3 / 21 EU business buyers, 18 / 19 / 20 One Stop Shop (setting "Registered for One Stop Shop"), 2 / 17 outside the EU, 11 small business.
Customer contacts (organisation with VAT ID or person, guests once per e-mail and company), with the CS-Cart reference in the description.
Payment bookings on a clearing or cash account (bookAmount), optional refund bookings.
Credit notes from the invoice for the refund status and completed RMA returns, capped at what is left on the invoice.
Invoice state read back by the cron; optional order status when sevDesk shows the invoice paid.
PDF download in the admin and vendor panel, PDF for signed-in customers (finalized documents only).
Every create recorded before the call and looked up after a lost answer (invoice reference, contact reference); unclear attempts wait for "Issue now".
Multi-Vendor: owner account or one sevDesk account per vendor, vendor privileges per action. CS-Cart Ultimate: an administrator limited to one storefront sees and acts on that storefront's documents, jobs and log only.
Order links, contact map, connection and settings kept on uninstall unless "Permanently delete all invoice data on uninstall" is ticked.
Tested against a local mock built to the official sevDesk OpenAPI document; not run against a real sevDesk account.
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
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