Send payment reminder
Send a Mahnung or Zahlungserinnerung for an overdue invoice, with an optional fee.
POST https://cotlet.dev/api/v1/lexware-office/documents/{document_id}/payment-reminders
write Confirm
Opens Mahnen on the invoice, uses your saved reminder text, adds a Mahngebühr line when you pass a fee and sends the reminder by email. It works only for invoices created in Lexware Office, not imported ones. The customer receives it at once, and the reminder then appears in the Mahnungen section of the invoice. By default you confirm each call; you can switch that off for this tool.
Parameters
| Name | Type | Description |
|---|---|---|
| document_id string required | string | Document ID from list_documents or create_invoice. |
| fee_amount number | number | Reminder fee in EUR, added as an item of type Mahngebühr. Default: no fee. |
| intro_text string | string | Introduction text of the reminder. Default: your saved text. |
Request
curl -X POST https://cotlet.dev/api/v1/lexware-office/documents/d_9c31be/payment-reminders \
-H "Authorization: Bearer $COTLET_API_KEY" \
-H "Content-Type: application/json" \
-d '{"fee_amount":5}'result = client.call("lexware-office", "send_payment_reminder", {"document_id":"d_9c31be","fee_amount":5})const result = await cotlet.call('lexware-office', 'send_payment_reminder', {"document_id":"d_9c31be","fee_amount":5});cotlet call lexware-office send_payment_reminder --data '{"document_id":"d_9c31be","fee_amount":5}'Example response
{
"document_id": "d_9c31be",
"number": "RE1031",
"reminder_number": 1,
"fee_amount": 5,
"sent_to": "buchhaltung@nordlicht.example",
"sent_at": "2026-10-14T08:02:00+02:00"
}