Skip to main content
Automate payment reminders in your company’s name. Submit invoices from your software, follow the reminder process, and keep payment information up to date.
The Mahnservice API is currently in beta and may undergo breaking changes without prior notice.

​
What you can do

  • Submit invoices for reminders. Send invoices from your software and choose when to release them into the reminder process. A connected bookkeeping system is optional.
  • Track reminder progress. Check invoice status, see which reminders were sent and what comes next, and receive webhook notifications about changes.
  • Report incoming payments. Keep invoice balances up to date during the reminder process and stop reminders once an invoice is fully paid.
  • Hand unpaid invoices over to collection. When the reminder sequence ends with an unpaid invoice, it is automatically transferred to paywise debt collection (Inkasso). Follow the resulting case through the Case Management API.
You can also attach the original invoice PDF, pause and resume reminders, or cancel an invoice. Configure the reminder sequence (Mahnlauf) in the paywise portal; your integration controls which invoices enter it.

​
Get started

  1. Create a paywise account, or sign in to your existing account.
  2. Open Für Entwickler → Zur Sandbox and create an API key in the sandbox portal. Mahnservice uses the same company API key as Case Management.
  3. Configure and activate a reminder sequence in the sandbox portal under Mahnservice → Erste Schritte. Follow the sandbox setup guide to test without purchasing a subscription, sending reminders to customers, or moving money.
  4. Follow the quickstart to submit a test invoice, release it for reminders, and check its progress.
To start reminders in production, you need an active Mahnservice subscription.

​
Explore the documentation

Invoice lifecycle

Understand submission, release, payment reporting, and the reminder states.

Invoice documents

Attach the original invoice PDF to your reminders.

Ownership and access

Learn which invoices you can change and what happens after collection handover.

API reference

Look up endpoints, request fields, and responses.