For FastBill users
FastBill dunning, automated flat rate instead of per case.
In FastBill, automatic dunning is a paid add-on billed per dunning case — with one payment reminder and up to three dunning letters. DunningHero connects directly to FastBill and duns in up to nine levels, for a monthly price based on how many invoices are overdue at once.
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How your invoice reaches us
FastBill
keeps invoices and payments
connected directlyDunningHero
sends reminders and dunning letters
Nothing is sent until you switch sending on
Connected directly
Connect once, and the invoices arrive by themselves.
DunningHero connects directly to FastBill. No export, no list to upload, nothing typed twice.
Sign-in
Your FastBill email address and an API key — added once, done.
What comes across
Customers, open and overdue invoices and payments.
Always current
Where FastBill reports changes by webhook, an invoice reaches us seconds later — otherwise the regular sync picks it up.
Partial payments, credit notes, cancellations and invoices on payment terms that are not dunned are recognised and handled correctly.
The difference
What FastBill does and what comes after.
One price for the whole chain, not for every case.
Today in FastBill
With DunningHero
- 01
Today in FastBill
Automatic dunning is a paid add-on, billed per dunning case.
With DunningHero
One monthly price by the number of invoices overdue at once — email sending is included in every plan.
- 02
Today in FastBill
One payment reminder and up to three dunning letters, all deadlines counted from the due date.
With DunningHero
Up to six payment reminders and three dunning levels; each level waits after the previous letter for as long as you set.
- 03
Today in FastBill
Each level goes by email or, with credits, by post.
With DunningHero
Email or letter, as an Einwurf-Einschreiben from a level you choose, a text message alongside if you like — and default interest under § 288 BGB as its own line.
GuideCreating and automating dunning letters in FastBill
Read the guideHow it works
Connected in four steps.
- 1
Connect FastBill
Sign in once or add a key — after that there is nothing left to transfer.
- 2
Invoices arrive
Open and overdue invoices, customers and payments appear in DunningHero and stay current.
- 3
Set your levels
Deadlines, texts, channels and fees per level — or take our templates. Free for 14 days.
- 4
Switch sending on
Nothing goes out before you allow it. Until then you only see what would happen.
Features
What runs by itself from then on.
Up to nine levels
Six payment reminders and three dunning letters, each with its own deadline, wording and tone.
No login needed
The run follows your schedule. You hear from us because something went out — not so that it can.
Payment stops the chain
Once the amount is settled in your accounting system, the next sync ends the escalation.
Text and letter, not just email
As add-ons: a short text message alongside the level and, when needed, a letter we print and post — for customers who overlook email.
Dunning fees and interest
A €5.00 fee per dunning level by default, freely adjustable, never on a payment reminder. Default interest from the day of default — at the consumer rate or, via a setting, the business rate.
Pause instead of switching off
Pause a single invoice or a whole customer — one click, with the reason kept in the audit trail.
Pricing
Priced by overdue invoices in flight.
Not per seat, not per revenue. Annual billing is 15% cheaper.
Recommended: Business
- 14 days free, no card
- No setup fee
- Monthly plans cancel monthly
- All prices net, plus VAT.
Do I need FastBill's dunning add-on for this?
How does DunningHero charge?
Does DunningHero notice when a payment arrives in FastBill?
Sources
Statements about FastBill follow the vendor's public pages, last checked in September 2026. Something out of date? Tell us and we will correct it.
FastBill is a trademark of its respective owner. DunningHero is not affiliated with or endorsed by FastBill.
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