sevDesk Sync for WHMCS
Create sevDesk invoices from WHMCS, flag them as e-invoices where sevDesk supports it, and keep payments and credit notes in step.
What will the sevDesk sync do?
It moves your WHMCS billing into sevDesk as it happens. New clients become sevDesk contacts. Each finalized WHMCS invoice and each WHMCS 9 credit note is created in sevDesk with its lines and tax rule. On sevDesk accounts that support it, the invoice is flagged as an e-invoice, and the addon can fetch the e-invoice file for the WHMCS email. Payments booked in sevDesk mark the WHMCS invoice paid.
This product is built to order: you get the license key at purchase and the download within 15 business days.
What does WHMCS already do, and what does this add?
WHMCS has no connection to sevDesk, so invoices are entered twice or imported by hand. The addon adds the contact and invoice sync, the tax rules, the e-invoice flag, payment status in both directions and a log.
What is included?
| Part | What you get |
|---|---|
| Contacts | WHMCS clients created and updated in sevDesk |
| Invoices and credit notes | Finalized WHMCS invoices and WHMCS 9 credit notes created in sevDesk |
| Tax rules | Domestic, reverse charge, EU OSS and non-EU cases set per client |
| E-invoices | The sevDesk e-invoice flag set and the file fetched, on accounts that support it |
| Payments | Payments booked in sevDesk mark the WHMCS invoice paid |
| Log | Every request logged, with retry for failures |
Who is it for?
Small hosting companies, agencies and software sellers in Germany and Austria that bill in WHMCS and do their bookkeeping in sevDesk. If you use Lexware Office instead, see my Lexware Office sync.
What do you need, and what are the limits?
Requirements: WHMCS 8.13 or 9.x (I confirm your exact version at purchase), PHP 8.1 or newer, the WHMCS cron running, and a sevDesk account with an API token.
Limits: the sevDesk e-invoice functions are only available on sevDesk accounts running its newer system version; on older accounts the addon syncs normal invoices. Decide with me before the first sync which system numbers the invoices. The addon does not sync expenses or bank transactions, and it is not tax advice.
It costs $149 once for a lifetime license with twelve months of updates and support, the license key at purchase and the download within 15 business days, and a seven-day refund window.
Key features
- WHMCS clients synced as sevDesk contacts
- Finalized invoices created in sevDesk with lines and tax
- WHMCS 9 credit notes created in sevDesk
- Tax rules mapped: domestic, reverse charge, EU OSS, non-EU
- sevDesk e-invoice flag and file, where the account supports it
- Payments in sevDesk mark the WHMCS invoice paid
- Log of every request with retry for failures
Why customers buy this module
- →No double entry between WHMCS and sevDesk
- →Open items match in both systems
- →A route to e-invoices through your accounting tool
Frequently asked questions
Can it send e-invoices?
On sevDesk accounts that support e-invoices, the addon sets the e-invoice flag when it creates the invoice and can fetch the e-invoice file for the WHMCS email. On older sevDesk accounts it syncs normal invoices only. If you want e-invoices made inside WHMCS instead, see my XRechnung and ZUGFeRD addon.
Does it import my old invoices?
It syncs invoices from the day you turn it on. A one-off import of older invoices can be added as separate work; tell me the date range before you buy.
When will I get it, and what if you can't deliver?
You get the license key at purchase and the download within 15 business days of purchase. If I do not deliver it in that time, you get a full refund. Otherwise the store's seven-day refund window applies.
Technical specifications
- WHMCS
- 8.13 and 9.x (confirmed at purchase)
- PHP
- 8.1+
- Accounting
- sevDesk API
- Availability
- Built to order, delivered in 15 business days
- License
- Lifetime, 1 year of updates and support included
- Delivery
- Instant download and license key
- Refund window
- 7 days
Related modules
DATEV Export for WHMCS
I built this DATEV export for a German hosting company. It turns a month of WHMCS invoices into an EXTF posting batch with the right revenue account for each country and VAT case, shows every posting before export, and can zip all invoice PDFs for the tax advisor.
German Invoice PDFs (§ 14 UStG) for WHMCS
I built this addon for a German hosting company that bills in WHMCS. It draws every invoice and correction PDF with seller and buyer details, service periods, tax per rate and the right VAT note, and it flags WHMCS settings and number gaps a tax office would question.
Moneybird Billing Integration for WHMCS
I built this module for a hosting company that bills through Moneybird instead of WHMCS invoices. Orders and renewals become Moneybird sales invoices, payments come back by webhook to activate services, and clients can pay now, by SEPA direct debit or on a monthly invoice.