curl --request POST \
  --url https://api.zivio.net/api/v3/purchase_orders \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <api-key>' \
  --header 'zivio-tenant-id: <api-key>' \
  --data '
{
  "purchase_order": [
    {
      "external_provider": "External System",
      "external_id": "ExSys67687",
      "po_number": "ExSys67687",
      "status": "issued",
      "version": "0",
      "owners": {
        "job": "23",
        "supplier": "23"
      }
    }
  ]
}
'

import requests

url = "https://api.zivio.net/api/v3/purchase_orders"

payload = { "purchase_order": [
        {
            "external_provider": "External System",
            "external_id": "ExSys67687",
            "po_number": "ExSys67687",
            "status": "issued",
            "version": "0",
            "owners": {
                "job": "23",
                "supplier": "23"
            }
        }
    ] }
headers = {
    "X-API-Key": "<api-key>",
    "zivio-tenant-id": "<api-key>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {
    'X-API-Key': '<api-key>',
    'zivio-tenant-id': '<api-key>',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    purchase_order: [
      {
        external_provider: 'External System',
        external_id: 'ExSys67687',
        po_number: 'ExSys67687',
        status: 'issued',
        version: '0',
        owners: {job: '23', supplier: '23'}
      }
    ]
  })
};

fetch('https://api.zivio.net/api/v3/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.zivio.net/api/v3/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([
    'purchase_order' => [
        [
                'external_provider' => 'External System',
                'external_id' => 'ExSys67687',
                'po_number' => 'ExSys67687',
                'status' => 'issued',
                'version' => '0',
                'owners' => [
                                'job' => '23',
                                'supplier' => '23'
                ]
        ]
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "X-API-Key: <api-key>",
    "zivio-tenant-id: <api-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.zivio.net/api/v3/purchase_orders"

	payload := strings.NewReader("{\n  \"purchase_order\": [\n    {\n      \"external_provider\": \"External System\",\n      \"external_id\": \"ExSys67687\",\n      \"po_number\": \"ExSys67687\",\n      \"status\": \"issued\",\n      \"version\": \"0\",\n      \"owners\": {\n        \"job\": \"23\",\n        \"supplier\": \"23\"\n      }\n    }\n  ]\n}")

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

	req.Header.Add("X-API-Key", "<api-key>")
	req.Header.Add("zivio-tenant-id", "<api-key>")
	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.zivio.net/api/v3/purchase_orders")
  .header("X-API-Key", "<api-key>")
  .header("zivio-tenant-id", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"purchase_order\": [\n    {\n      \"external_provider\": \"External System\",\n      \"external_id\": \"ExSys67687\",\n      \"po_number\": \"ExSys67687\",\n      \"status\": \"issued\",\n      \"version\": \"0\",\n      \"owners\": {\n        \"job\": \"23\",\n        \"supplier\": \"23\"\n      }\n    }\n  ]\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.zivio.net/api/v3/purchase_orders")

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

request = Net::HTTP::Post.new(url)
request["X-API-Key"] = '<api-key>'
request["zivio-tenant-id"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"purchase_order\": [\n    {\n      \"external_provider\": \"External System\",\n      \"external_id\": \"ExSys67687\",\n      \"po_number\": \"ExSys67687\",\n      \"status\": \"issued\",\n      \"version\": \"0\",\n      \"owners\": {\n        \"job\": \"23\",\n        \"supplier\": \"23\"\n      }\n    }\n  ]\n}"

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

{
  "id": "23",
  "external_provider": "External Service",
  "external_id": "EX67868",
  "po_number": "EX67868",
  "version": 123,
  "status": "<string>",
  "owners": {
    "job": "2",
    "supplier": "2"
  }
}