Create a client

curl --request POST \
  --url https://api.envoi.no/v1/clients \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --header 'Idempotency-Key: <idempotency-key>' \
  --data '
{
  "name": "Fjordkaffe AS",
  "type": "business",
  "orgNumber": "912345688",
  "country": "NO",
  "email": "post@fjordkaffe.no",
  "phone": "+47 55 12 34 56",
  "address": "Kaigata 1",
  "postalCode": "5003",
  "city": "Bergen",
  "contactPerson": "Ingrid Fjeld"
}
'

import requests

url = "https://api.envoi.no/v1/clients"

payload = {
    "name": "Fjordkaffe AS",
    "type": "business",
    "orgNumber": "912345688",
    "country": "NO",
    "email": "post@fjordkaffe.no",
    "phone": "+47 55 12 34 56",
    "address": "Kaigata 1",
    "postalCode": "5003",
    "city": "Bergen",
    "contactPerson": "Ingrid Fjeld"
}
headers = {
    "Idempotency-Key": "<idempotency-key>",
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {
    'Idempotency-Key': '<idempotency-key>',
    Authorization: 'Bearer <token>',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    name: 'Fjordkaffe AS',
    type: 'business',
    orgNumber: '912345688',
    country: 'NO',
    email: 'post@fjordkaffe.no',
    phone: '+47 55 12 34 56',
    address: 'Kaigata 1',
    postalCode: '5003',
    city: 'Bergen',
    contactPerson: 'Ingrid Fjeld'
  })
};

fetch('https://api.envoi.no/v1/clients', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.envoi.no/v1/clients",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'name' => 'Fjordkaffe AS',
    'type' => 'business',
    'orgNumber' => '912345688',
    'country' => 'NO',
    'email' => 'post@fjordkaffe.no',
    'phone' => '+47 55 12 34 56',
    'address' => 'Kaigata 1',
    'postalCode' => '5003',
    'city' => 'Bergen',
    'contactPerson' => 'Ingrid Fjeld'
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: application/json",
    "Idempotency-Key: <idempotency-key>"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://api.envoi.no/v1/clients"

	payload := strings.NewReader("{\n  \"name\": \"Fjordkaffe AS\",\n  \"type\": \"business\",\n  \"orgNumber\": \"912345688\",\n  \"country\": \"NO\",\n  \"email\": \"post@fjordkaffe.no\",\n  \"phone\": \"+47 55 12 34 56\",\n  \"address\": \"Kaigata 1\",\n  \"postalCode\": \"5003\",\n  \"city\": \"Bergen\",\n  \"contactPerson\": \"Ingrid Fjeld\"\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("Idempotency-Key", "<idempotency-key>")
	req.Header.Add("Authorization", "Bearer <token>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://api.envoi.no/v1/clients")
  .header("Idempotency-Key", "<idempotency-key>")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"name\": \"Fjordkaffe AS\",\n  \"type\": \"business\",\n  \"orgNumber\": \"912345688\",\n  \"country\": \"NO\",\n  \"email\": \"post@fjordkaffe.no\",\n  \"phone\": \"+47 55 12 34 56\",\n  \"address\": \"Kaigata 1\",\n  \"postalCode\": \"5003\",\n  \"city\": \"Bergen\",\n  \"contactPerson\": \"Ingrid Fjeld\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.envoi.no/v1/clients")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["Idempotency-Key"] = '<idempotency-key>'
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"name\": \"Fjordkaffe AS\",\n  \"type\": \"business\",\n  \"orgNumber\": \"912345688\",\n  \"country\": \"NO\",\n  \"email\": \"post@fjordkaffe.no\",\n  \"phone\": \"+47 55 12 34 56\",\n  \"address\": \"Kaigata 1\",\n  \"postalCode\": \"5003\",\n  \"city\": \"Bergen\",\n  \"contactPerson\": \"Ingrid Fjeld\"\n}"

response = http.request(request)
puts response.read_body

{
  "id": "c2a9d4e1-5b7f-4c3a-8e6d-1f2a3b4c5d6e",
  "name": "Fjordkaffe AS",
  "type": "business",
  "orgNumber": "912345688",
  "vatNumber": null,
  "country": "NO",
  "email": "post@fjordkaffe.no",
  "phone": "+47 55 12 34 56",
  "address": "Kaigata 1",
  "postalCode": "5003",
  "city": "Bergen",
  "contactPerson": "Ingrid Fjeld",
  "createdAt": "2026-09-01T08:30:00Z",
  "updatedAt": "2026-09-01T08:30:00Z"
}

POST

https://api.envoi.no

clients

Create a client

curl --request POST \
  --url https://api.envoi.no/v1/clients \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --header 'Idempotency-Key: <idempotency-key>' \
  --data '
{
  "name": "Fjordkaffe AS",
  "type": "business",
  "orgNumber": "912345688",
  "country": "NO",
  "email": "post@fjordkaffe.no",
  "phone": "+47 55 12 34 56",
  "address": "Kaigata 1",
  "postalCode": "5003",
  "city": "Bergen",
  "contactPerson": "Ingrid Fjeld"
}
'

import requests

url = "https://api.envoi.no/v1/clients"

payload = {
    "name": "Fjordkaffe AS",
    "type": "business",
    "orgNumber": "912345688",
    "country": "NO",
    "email": "post@fjordkaffe.no",
    "phone": "+47 55 12 34 56",
    "address": "Kaigata 1",
    "postalCode": "5003",
    "city": "Bergen",
    "contactPerson": "Ingrid Fjeld"
}
headers = {
    "Idempotency-Key": "<idempotency-key>",
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {
    'Idempotency-Key': '<idempotency-key>',
    Authorization: 'Bearer <token>',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    name: 'Fjordkaffe AS',
    type: 'business',
    orgNumber: '912345688',
    country: 'NO',
    email: 'post@fjordkaffe.no',
    phone: '+47 55 12 34 56',
    address: 'Kaigata 1',
    postalCode: '5003',
    city: 'Bergen',
    contactPerson: 'Ingrid Fjeld'
  })
};

fetch('https://api.envoi.no/v1/clients', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.envoi.no/v1/clients",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'name' => 'Fjordkaffe AS',
    'type' => 'business',
    'orgNumber' => '912345688',
    'country' => 'NO',
    'email' => 'post@fjordkaffe.no',
    'phone' => '+47 55 12 34 56',
    'address' => 'Kaigata 1',
    'postalCode' => '5003',
    'city' => 'Bergen',
    'contactPerson' => 'Ingrid Fjeld'
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: application/json",
    "Idempotency-Key: <idempotency-key>"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://api.envoi.no/v1/clients"

	payload := strings.NewReader("{\n  \"name\": \"Fjordkaffe AS\",\n  \"type\": \"business\",\n  \"orgNumber\": \"912345688\",\n  \"country\": \"NO\",\n  \"email\": \"post@fjordkaffe.no\",\n  \"phone\": \"+47 55 12 34 56\",\n  \"address\": \"Kaigata 1\",\n  \"postalCode\": \"5003\",\n  \"city\": \"Bergen\",\n  \"contactPerson\": \"Ingrid Fjeld\"\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("Idempotency-Key", "<idempotency-key>")
	req.Header.Add("Authorization", "Bearer <token>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://api.envoi.no/v1/clients")
  .header("Idempotency-Key", "<idempotency-key>")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"name\": \"Fjordkaffe AS\",\n  \"type\": \"business\",\n  \"orgNumber\": \"912345688\",\n  \"country\": \"NO\",\n  \"email\": \"post@fjordkaffe.no\",\n  \"phone\": \"+47 55 12 34 56\",\n  \"address\": \"Kaigata 1\",\n  \"postalCode\": \"5003\",\n  \"city\": \"Bergen\",\n  \"contactPerson\": \"Ingrid Fjeld\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.envoi.no/v1/clients")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["Idempotency-Key"] = '<idempotency-key>'
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"name\": \"Fjordkaffe AS\",\n  \"type\": \"business\",\n  \"orgNumber\": \"912345688\",\n  \"country\": \"NO\",\n  \"email\": \"post@fjordkaffe.no\",\n  \"phone\": \"+47 55 12 34 56\",\n  \"address\": \"Kaigata 1\",\n  \"postalCode\": \"5003\",\n  \"city\": \"Bergen\",\n  \"contactPerson\": \"Ingrid Fjeld\"\n}"

response = http.request(request)
puts response.read_body

{
  "id": "c2a9d4e1-5b7f-4c3a-8e6d-1f2a3b4c5d6e",
  "name": "Fjordkaffe AS",
  "type": "business",
  "orgNumber": "912345688",
  "vatNumber": null,
  "country": "NO",
  "email": "post@fjordkaffe.no",
  "phone": "+47 55 12 34 56",
  "address": "Kaigata 1",
  "postalCode": "5003",
  "city": "Bergen",
  "contactPerson": "Ingrid Fjeld",
  "createdAt": "2026-09-01T08:30:00Z",
  "updatedAt": "2026-09-01T08:30:00Z"
}

Authorizations

Authorization

string

header

required

OAuth 2.0 client credentials. The token request also needs the audience form field (the Account ID), which OAuth tooling does not always send; see POST /v1/oauth/token.

Headers

Idempotency-Key

string

required

Required on every POST, at most 255 characters. Use a new UUID for each logical operation. The first request with a key runs, and its answer (any status below 500) is stored for 7 days. A retry with the same key, method, path and body gets the stored answer again with Idempotency-Replayed: true, and nothing runs twice. The same key with a different body or path is 422 idempotency-key-reused; the same key while the first request is still running is 409 idempotency-key-in-progress. A 5xx answer is not stored, so the same key may be retried. A key belongs to the API client's grant (one environment).

Maximum string length: 255

Body

application/json

The client.

A new client.

name

string

required

The client's name. Required.

type

string | null

business (the default) or consumer.

orgNumber

string | null

Organisation number. Required for a Norwegian business (9 digits).

vatNumber

string | null

A foreign client's VAT number.

country

string | null

ISO 3166-1 alpha-2 country code; NO when left out.

string | null

Email address.

phone

string | null

Phone number.

address

string | null

Street address.

postalCode

string | null

Postal code.

city

string | null

City.

contactPerson

string | null

Contact person.

Response

The new client.

A client in the account's customer register.

string<uuid>

required

The client's id.

name

string

required

The client's name.

type

string

required

business or consumer.

orgNumber

string

required

Organisation number; empty when none.

country

string

required

ISO 3166-1 alpha-2 country code, for example NO.

string

required

Email address; empty when none.

phone

string

required

Phone number; empty when none.

address

string

required

Street address.

postalCode

string

required

Postal code.

city

string

required

City.

contactPerson

string

required

Contact person; empty when none.

createdAt

string<date-time>

required

When it was created (UTC).

updatedAt

string<date-time>

required

When it last changed (UTC).

vatNumber

string | null

A foreign client's VAT number, or null.

Get started

Authentication

Invoices

Customers

Accounting

Create a client

Authorizations

Headers

Body

Response