Create a purchase order

curl --request POST \
  --url https://api.arcuserp.com/v1/purchase-orders \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "vendor_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "account_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "location_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "payment_term_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "expected_date": "2023-12-25",
  "notes": "<string>",
  "items": [
    {
      "product_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "quantity": 123,
      "unit_cost": 123
    }
  ]
}
'

import requests

url = "https://api.arcuserp.com/v1/purchase-orders"

payload = {
    "vendor_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "account_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "location_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "payment_term_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "expected_date": "2023-12-25",
    "notes": "<string>",
    "items": [
        {
            "product_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
            "quantity": 123,
            "unit_cost": 123
        }
    ]
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    vendor_id: '3c90c3cc-0d44-4b50-8888-8dd25736052a',
    account_id: '3c90c3cc-0d44-4b50-8888-8dd25736052a',
    location_id: '3c90c3cc-0d44-4b50-8888-8dd25736052a',
    payment_term_id: '3c90c3cc-0d44-4b50-8888-8dd25736052a',
    expected_date: '2023-12-25',
    notes: '<string>',
    items: [
      {
        product_id: '3c90c3cc-0d44-4b50-8888-8dd25736052a',
        quantity: 123,
        unit_cost: 123
      }
    ]
  })
};

fetch('https://api.arcuserp.com/v1/purchase-orders', 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.arcuserp.com/v1/purchase-orders",
  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([
    'vendor_id' => '3c90c3cc-0d44-4b50-8888-8dd25736052a',
    'account_id' => '3c90c3cc-0d44-4b50-8888-8dd25736052a',
    'location_id' => '3c90c3cc-0d44-4b50-8888-8dd25736052a',
    'payment_term_id' => '3c90c3cc-0d44-4b50-8888-8dd25736052a',
    'expected_date' => '2023-12-25',
    'notes' => '<string>',
    'items' => [
        [
                'product_id' => '3c90c3cc-0d44-4b50-8888-8dd25736052a',
                'quantity' => 123,
                'unit_cost' => 123
        ]
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($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.arcuserp.com/v1/purchase-orders"

	payload := strings.NewReader("{\n  \"vendor_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"account_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"location_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"payment_term_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"expected_date\": \"2023-12-25\",\n  \"notes\": \"<string>\",\n  \"items\": [\n    {\n      \"product_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n      \"quantity\": 123,\n      \"unit_cost\": 123\n    }\n  ]\n}")

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

	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.arcuserp.com/v1/purchase-orders")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"vendor_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"account_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"location_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"payment_term_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"expected_date\": \"2023-12-25\",\n  \"notes\": \"<string>\",\n  \"items\": [\n    {\n      \"product_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n      \"quantity\": 123,\n      \"unit_cost\": 123\n    }\n  ]\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.arcuserp.com/v1/purchase-orders")

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

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"vendor_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"account_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"location_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"payment_term_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"expected_date\": \"2023-12-25\",\n  \"notes\": \"<string>\",\n  \"items\": [\n    {\n      \"product_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n      \"quantity\": 123,\n      \"unit_cost\": 123\n    }\n  ]\n}"

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

{
  "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "object": "purchase_order",
  "entity_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "po_number": "<string>",
  "vendor_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "location_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "status": "draft",
  "po_date": "2023-11-07T05:31:56Z",
  "expected_date": "2023-11-07T05:31:56Z",
  "subtotal": 123,
  "tax_total": 123,
  "shipping_total": 123,
  "po_total": 123,
  "currency": "USD",
  "notes": "<string>",
  "internal_notes": "<string>",
  "metadata": {},
  "created_at": "2023-11-07T05:31:56Z",
  "updated_at": "2023-11-07T05:31:56Z",
  "approved_total": 123,
  "approval_stale": true,
  "header_editability": {}
}

{
  "error": "not_found",
  "code": "not_found",
  "type": "not_found",
  "hint": "The requested order does not exist or does not belong to this entity.",
  "param": "expand[0]",
  "required": "accounts:read",
  "request_id": "req_abc123"
}

{
  "error": "not_found",
  "code": "not_found",
  "type": "not_found",
  "hint": "The requested order does not exist or does not belong to this entity.",
  "param": "expand[0]",
  "required": "accounts:read",
  "request_id": "req_abc123"
}

{
  "error": "not_found",
  "code": "not_found",
  "type": "not_found",
  "hint": "The requested order does not exist or does not belong to this entity.",
  "param": "expand[0]",
  "required": "accounts:read",
  "request_id": "req_abc123"
}

Purchasing

Create a purchase order

Required API key scope: purchasing:write

Creates a new purchase order in draft status. You must identify the vendor using either vendor_id (the natural B2B convention, preferred) or account_id (legacy alias — both refer to the same vendor account UUID). If both are supplied, account_id takes precedence. At least one is required.

JSON body examples:

Shape A (preferred — vendor_id):

{
  "vendor_id": "df56267d-7890-41a2-a62c-ee8955aab150",
  "notes": "Q3 stock order"
}

Shape B (alias — account_id):

{
  "account_id": "df56267d-7890-41a2-a62c-ee8955aab150",
  "notes": "Q3 stock order"
}

POST

purchase-orders

Create a purchase order

curl --request POST \
  --url https://api.arcuserp.com/v1/purchase-orders \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "vendor_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "account_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "location_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "payment_term_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "expected_date": "2023-12-25",
  "notes": "<string>",
  "items": [
    {
      "product_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "quantity": 123,
      "unit_cost": 123
    }
  ]
}
'

import requests

url = "https://api.arcuserp.com/v1/purchase-orders"

payload = {
    "vendor_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "account_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "location_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "payment_term_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "expected_date": "2023-12-25",
    "notes": "<string>",
    "items": [
        {
            "product_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
            "quantity": 123,
            "unit_cost": 123
        }
    ]
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    vendor_id: '3c90c3cc-0d44-4b50-8888-8dd25736052a',
    account_id: '3c90c3cc-0d44-4b50-8888-8dd25736052a',
    location_id: '3c90c3cc-0d44-4b50-8888-8dd25736052a',
    payment_term_id: '3c90c3cc-0d44-4b50-8888-8dd25736052a',
    expected_date: '2023-12-25',
    notes: '<string>',
    items: [
      {
        product_id: '3c90c3cc-0d44-4b50-8888-8dd25736052a',
        quantity: 123,
        unit_cost: 123
      }
    ]
  })
};

fetch('https://api.arcuserp.com/v1/purchase-orders', 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.arcuserp.com/v1/purchase-orders",
  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([
    'vendor_id' => '3c90c3cc-0d44-4b50-8888-8dd25736052a',
    'account_id' => '3c90c3cc-0d44-4b50-8888-8dd25736052a',
    'location_id' => '3c90c3cc-0d44-4b50-8888-8dd25736052a',
    'payment_term_id' => '3c90c3cc-0d44-4b50-8888-8dd25736052a',
    'expected_date' => '2023-12-25',
    'notes' => '<string>',
    'items' => [
        [
                'product_id' => '3c90c3cc-0d44-4b50-8888-8dd25736052a',
                'quantity' => 123,
                'unit_cost' => 123
        ]
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($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.arcuserp.com/v1/purchase-orders"

	payload := strings.NewReader("{\n  \"vendor_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"account_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"location_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"payment_term_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"expected_date\": \"2023-12-25\",\n  \"notes\": \"<string>\",\n  \"items\": [\n    {\n      \"product_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n      \"quantity\": 123,\n      \"unit_cost\": 123\n    }\n  ]\n}")

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

	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.arcuserp.com/v1/purchase-orders")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"vendor_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"account_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"location_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"payment_term_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"expected_date\": \"2023-12-25\",\n  \"notes\": \"<string>\",\n  \"items\": [\n    {\n      \"product_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n      \"quantity\": 123,\n      \"unit_cost\": 123\n    }\n  ]\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.arcuserp.com/v1/purchase-orders")

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

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"vendor_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"account_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"location_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"payment_term_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"expected_date\": \"2023-12-25\",\n  \"notes\": \"<string>\",\n  \"items\": [\n    {\n      \"product_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n      \"quantity\": 123,\n      \"unit_cost\": 123\n    }\n  ]\n}"

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

{
  "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "object": "purchase_order",
  "entity_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "po_number": "<string>",
  "vendor_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "location_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "status": "draft",
  "po_date": "2023-11-07T05:31:56Z",
  "expected_date": "2023-11-07T05:31:56Z",
  "subtotal": 123,
  "tax_total": 123,
  "shipping_total": 123,
  "po_total": 123,
  "currency": "USD",
  "notes": "<string>",
  "internal_notes": "<string>",
  "metadata": {},
  "created_at": "2023-11-07T05:31:56Z",
  "updated_at": "2023-11-07T05:31:56Z",
  "approved_total": 123,
  "approval_stale": true,
  "header_editability": {}
}

{
  "error": "not_found",
  "code": "not_found",
  "type": "not_found",
  "hint": "The requested order does not exist or does not belong to this entity.",
  "param": "expand[0]",
  "required": "accounts:read",
  "request_id": "req_abc123"
}

{
  "error": "not_found",
  "code": "not_found",
  "type": "not_found",
  "hint": "The requested order does not exist or does not belong to this entity.",
  "param": "expand[0]",
  "required": "accounts:read",
  "request_id": "req_abc123"
}

{
  "error": "not_found",
  "code": "not_found",
  "type": "not_found",
  "hint": "The requested order does not exist or does not belong to this entity.",
  "param": "expand[0]",
  "required": "accounts:read",
  "request_id": "req_abc123"
}

Authorizations

Authorization

string

header

required

API key issued per entity via Settings > Developers > API Keys. Each key carries scopes (e.g. orders:read, products:write). Bearer token format: Authorization: Bearer ark_live_ent_Test keys use ark_test_ent_. Both are issued per entity via Settings > Developers > API Keys.

Body

application/json

Either vendor_id or account_id is required (both refer to the same vendor account UUID). vendor_id is the preferred B2B convention; account_id is the legacy internal alias. If both are present, account_id wins.

vendor_id

string<uuid>

UUID of the vendor account (preferred field name -- matches B2B convention used throughout the purchasing API). Alias for account_id.

account_id

string<uuid>

UUID of the vendor account (legacy internal alias for vendor_id). Accepted for backward compatibility. If both vendor_id and account_id are provided, account_id takes precedence.

location_id

string<uuid>

payment_term_id

string<uuid>

expected_date

string<date>

notes

string

items

object[]

Show child attributes

Response

Created purchase order

A purchase order issued to a vendor.

string<uuid>

object

enum<string>

Available options:

purchase_order

entity_id

string<uuid>

read-only

po_number

string

read-only

vendor_id

string<uuid>

location_id

string<uuid> | null

status

enum<string>

read-only

Available options:

draft,

approved,

sent,

partially_received,

received,

closed,

cancelled

po_date

string<date-time>

expected_date

string<date-time> | null

subtotal

number

tax_total

number

shipping_total

number

po_total

number

currency

string

default:USD

notes

string | null

internal_notes

string | null

metadata

object | null

created_at

string<date-time>

read-only

updated_at

string<date-time>

read-only

approved_total

number | null

read-only

The order total as it stood when an approver approved this purchase order -- the basis they actually saw. NULL on every approval predating 2026-08-17 (no backfill) and NULL means "basis unknown", which is treated as fail-safe.

approval_stale

boolean

read-only

DERIVED, not stored. True when the order is approved AND its total has since risen above approved_total. The purchase order still receives normally; this is a non-blocking prompt to re-approve.

header_editability

object

read-only

Per-field verdicts for the header fields, from the same predicate the write handlers enforce. Keys: notes, internal_notes, due_date, expected_date, location_id, po_tracking_reference. Each is { allowed: boolean, reason: string|null } where reason is a token from the PoLineEditReason vocabulary.

Show child attributes

Overview

All Endpoints

Create a purchase order

Authorizations

Body

Response