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# Fiken API

> Every Fiken endpoint on Cotlet: inputs, JSON Schema, cURL, Python and Node.js examples and an example response for each call.

Source: https://cotlet.dev/docs/api/fiken

Docs sections: [Get started](https://cotlet.dev/docs.md) · [REST API](https://cotlet.dev/docs/api.md) · [MCP](https://cotlet.dev/docs/mcp.md) · [SDKs & CLI](https://cotlet.dev/docs/sdks.md) · [Integrations](https://cotlet.dev/docs/integrations.md)

14 endpoints for Fiken, each at its own method and path, called with your API key. Open an endpoint for its inputs, examples and response.

- Base URL: `https://cotlet.dev/api/v1/fiken`
- Connects with: Your own Fiken user with access to the company, access type Hele regnskapet for invoices and purchases
- Integration page: https://cotlet.dev/integrations/fiken-api-mcp-server

## Read

Return data and change nothing in the account.

| Endpoint | Description |
|---|---|
| [`GET /contacts`](https://cotlet.dev/docs/api/fiken/list_contacts.md) | Customers and suppliers with ID, name, organisation number, email and customer or supplier number. |
| [`GET /invoices`](https://cotlet.dev/docs/api/fiken/list_invoices.md) | Sales invoices with number, customer, dates, gross amount and remaining balance. |
| [`GET /invoices/{invoice_id}`](https://cotlet.dev/docs/api/fiken/get_invoice.md) | One invoice with its lines, totals, sent state and payments. |
| [`GET /purchases`](https://cotlet.dev/docs/api/fiken/list_purchases.md) | Purchases with supplier, date, invoice number, gross amount and what is still unpaid. |
| [`GET /inbox`](https://cotlet.dev/docs/api/fiken/list_inbox.md) | Documents in the Fiken inbox with name, upload date and whether they are used. |
| [`GET /bank-accounts`](https://cotlet.dev/docs/api/fiken/list_bank_accounts.md) | Bank accounts registered in the company, with the account code payments are booked on. |

## Write

Change the account. Calls marked Confirm wait for the user to approve them.

| Endpoint | Description |
|---|---|
| [`POST /contacts`](https://cotlet.dev/docs/api/fiken/create_contact.md) | Add a customer or supplier with name, email and organisation number. |
| [`POST /customers/{customer_id}/invoice-drafts`](https://cotlet.dev/docs/api/fiken/create_invoice_draft.md) | Save an invoice draft for a customer. Nothing is booked and nothing is sent. |
| [`POST /invoices`](https://cotlet.dev/docs/api/fiken/create_invoice.md) (Confirm) | Issue an invoice and book the income. It is created, not sent. |
| [`POST /invoices/{invoice_id}`](https://cotlet.dev/docs/api/fiken/send_invoice.md) (Confirm) | Send an invoice to the customer by EHF, eFaktura, email, SMS or letter. |
| [`POST /invoices/{invoice_id}/payment`](https://cotlet.dev/docs/api/fiken/register_invoice_payment.md) (Confirm) | Register a received payment, full or partial, on a customer invoice. |
| [`POST /invoices/{invoice_id}/reminders`](https://cotlet.dev/docs/api/fiken/create_reminder.md) (Confirm) | Send a payment reminder or a dunning letter for an overdue invoice. |
| [`POST /receipts`](https://cotlet.dev/docs/api/fiken/upload_receipt.md) | Put a receipt or supplier invoice in the Fiken inbox so it can be attached to a purchase. |
| [`POST /purchases`](https://cotlet.dev/docs/api/fiken/create_purchase.md) (Confirm) | Register a purchase from a supplier or a cash purchase, with VAT, cost account and payment. |

---

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Cotlet is an independent service. It is not affiliated with, endorsed by or sponsored by any of the products listed on this site. Product names are trademarks of their respective owners.

## For AI agents: sign your user up

Is your user asking you to sign them up for Cotlet? You can do it for them, no account or key needed.

1. Read the fields and their allowed values: GET https://cotlet.dev/api/v1/access-requests
2. Ask the user for each value: email, apps, what you will do with them. If they leave the password to you, generate a strong one and show it to them.
3. Show the user what you will send, then POST it as JSON to https://cotlet.dev/api/v1/access-requests.

One call creates the account and sends the access request; we email the user when access is granted.