Create invoice
Issue an invoice and book the income. It is created, not sent.
MCP tool fiken_write → create_invoice
write Confirm
Creates the invoice, like Opprett faktura in Fiken, from lines or from a draft_id, and registers the income in the accounts. It returns the invoice number and totals; the customer gets nothing until send_invoice runs. Fiken has no delete for invoices: a wrong invoice is corrected with a credit note in Fiken. Pass draft_id to issue a draft, or customer_id, days_until_due and lines to create one directly. By default you confirm each call; you can switch that off for this tool.
Parameters
| Name | Type | Description |
|---|---|---|
| draft_id integer | integer | Draft ID from create_invoice_draft. Use this or the fields below. |
| customer_id integer | integer | Contact ID. Required without draft_id. |
| issue_date date | date | Invoice date. Default: today. |
| days_until_due integer | integer | Days from the invoice date to the due date. Required without draft_id. |
| lines array | array | Required without draft_id. Objects with description, quantity, unit_price (net per unit, excluding VAT), vat_type (for example HIGH, MEDIUM, LOW or NONE), optional discount_percent and income_account. |
| invoice_text string | string | Comment printed above the invoice lines. |
| your_reference string | string | Your reference, printed on the invoice. |
| currency string | string | ISO 4217 code. Default: NOK. |
tools/call
{
"jsonrpc": "2.0",
"id": 1,
"method": "tools/call",
"params": {
"name": "fiken_write",
"arguments": {
"operation": "create_invoice",
"arguments": {
"customer_id": 4021188,
"issue_date": "2026-10-14",
"days_until_due": 14,
"lines": [
{
"description": "Consulting, October",
"quantity": 10,
"unit_price": 1200,
"vat_type": "HIGH"
}
]
}
}
}
}Example response
{
"content": [
{
"type": "text",
"text": "{ ... same JSON as structuredContent ... }"
}
],
"structuredContent": {
"invoice_id": 5120331,
"invoice_number": 10042,
"customer_id": 4021188,
"customer": "Nordlys Design AS",
"issue_date": "2026-10-14",
"due_date": "2026-10-28",
"net": 12000,
"vat": 3000,
"gross": 15000,
"currency": "NOK",
"sent": false
},
"isError": false
}