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Chase overdue Fiken invoices with payment reminders

Invoices pass their due date quietly, and someone has to open each one in Fiken, work out whether a reminder is allowed yet and send it.

Cotlet does it in your own Fiken account with list_invoices, get_invoice and create_reminder, called by your AI agent, an n8n workflow or a script.

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Hosted · nothing to install or maintain

Can Fiken do this on its own?

Fiken can chase automatically (checked 14 Oct 2026), but only with a KID agreement with your bank, KID/OCR ordered under Foretak → Tilleggstjenester and an agreement with Kravia, its partner for external follow-up; it applies only to invoices created after you switch it on. The Fiken API has no endpoint for reminders or dunning letters. Nothing in Fiken chases older invoices by a rule of your own.

How you do it in Fiken today

  1. Open Salg → Faktura-/salgsoversikt and look for invoices past their due date; the small arrow at the right of an invoice shows the options Fiken allows for it.
  2. Click the invoice and, once the due date has passed, click Veiviser for forfalt faktura.
  3. Click Lag en påminnelse eller purring, choose Følg opp på egenhånd, pick the type and create it, then send it to the customer.
  4. Fiken allows a reminder once the invoice is due, but no fee and no collection until 14 days after the due date.
  5. Repeat per invoice every week, and check before each one that the customer has not paid, because payments are registered by hand unless you have a KID agreement.

How to chase overdue Fiken invoices with payment reminders

Prompt

Every Monday, find overdue invoices in Fiken. Send a reminder by email to those up to 13 days overdue and a dunning letter to those 14 to 44 days overdue. List anything older for me and do not touch it.
  1. 01

    Find what is overdue

    list_invoices runs with status overdue and returns the invoices unpaid and past their due date, oldest first. Drafts and settled invoices are never in the list.

  2. 02

    Re-read each invoice

    get_invoice shows the balance and the payments registered so far. An invoice that got a payment after the list was read is skipped, so nobody is chased for money that arrived this morning.

  3. 03

    Pick the step by days past due

    The agent applies the rule from your prompt: a reminder in the first 13 days, a dunning letter from day 14, and nothing automatic beyond the limit you set. Fiken itself refuses a fee before day 14, so the agent never asks for one earlier.

  4. 04

    Send by email

    create_reminder goes out by email by default. Fiken does not send reminders as EHF, even when the invoice went out that way, so the agent does not try it. Each reminder waits for your OK by default.

  5. 05

    Leave collection to you

    Invoices past your limit are listed with days overdue and amount. Sending a case to external follow-up (inkasso) through Kravia stays your decision, and no Cotlet tool does it.

What you get back

Example data

Overdue invoices: 7
Reminders sent by email: 4, e.g. 10031 Havbris Maritim AS, 8,750 NOK, 14 days overdue
Dunning letters sent: 1 (invoice 9984, 31 days overdue)
Skipped 1: payment registered since the list was read
Left for you 1: invoice 9950 is 52 days overdue, your call on external follow-up

Other ways to ask

  • List overdue invoices by customer with total owed per customer, and send nothing.
  • Send a reminder only to customers whose invoice is between 1 and 7 days overdue and tell me who is left.
  • Every Friday, show invoices that will fall due next week so I can warn the big customers myself.
  • For invoices more than 30 days overdue, draft the follow-up message and wait for my OK before sending.

What Fiken allows, and what to know first

  • Fiken offers a reminder once the invoice is due, but no fee and no external collection until 14 days after the due date.
  • A dunning letter (purring) can carry a fee of at most kr 38 and must give the customer at least 14 days to pay, according to the Fiken help center.
  • Fiken does not send reminders or dunning letters as EHF; it suggests email even if the invoice went out by EHF.
  • If a customer pays without the dunning fee, register the amount actually paid first and then delete the fee, and the invoice stands as settled.
  • Changing the due date in Fiken does not change the invoice itself; it only records, for example, an oral agreement with the customer.

create_reminder asks for your OK by default. To run it weekly without you, switch confirmation off for that tool in your dashboard.

Sources: Fiken Help: Faktura - oversikt og oppfølging · Fiken Help: Hvordan opprette en purring manuelt i Fiken · Fiken Help: Automatisk purring av ubetalt faktura · Fiken API v2 documentation

Call create_reminder from a script

curl

curl -X POST https://cotlet.dev/api/v1/fiken/invoices/5120288/reminders \
  -H "Authorization: Bearer $COTLET_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"type":"reminder","method":"email"}'

Example response

{
  "invoice_id": 5120288,
  "invoice_number": 10031,
  "type": "reminder",
  "method": "email",
  "to": "okonomi@havbris.example",
  "days_overdue": 14
}

MCP: add https://cotlet.dev/mcp/v1 with the same key; the call is fiken_write → create_reminder. Example data.

Schedule it in n8n, Make, Zapier or cron

Fiken tools this automation uses

Cotlet Fiken tools used to chase overdue Fiken invoices with payment reminders
Tool Parameters
list_invoices status, customer_id, due_before, limit, cursor
get_invoice invoice_id
create_reminder invoice_id, type, method
All 14 Fiken tools with descriptions

Frequently asked questions

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