curl --request POST \
  --url https://api.zivio.net/api/v3/invoices \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <api-key>' \
  --header 'zivio-tenant-id: <api-key>' \
  --data '
{
  "type": "ItemisedInvoice",
  "description": "Invoice description",
  "ccy": "GBP",
  "job_id": "137",
  "due_on": "2020-11-01",
  "dated_on": "2020-10-21",
  "milestone_id": "78",
  "net_total_cents": "100000",
  "tax_total_cents": "20000",
  "total_cents": "120000",
  "invoice_items_attributes": [
    {
      "description": "Item description",
      "quantity": "5",
      "billing_start": "2020-11-01",
      "billing_end": "2020-11-03",
      "unit_type": "Hotel",
      "unit_cost_cents": "20000",
      "tax_type_id": "1"
    }
  ]
}
'

import requests

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

payload = {
    "type": "ItemisedInvoice",
    "description": "Invoice description",
    "ccy": "GBP",
    "job_id": "137",
    "due_on": "2020-11-01",
    "dated_on": "2020-10-21",
    "milestone_id": "78",
    "net_total_cents": "100000",
    "tax_total_cents": "20000",
    "total_cents": "120000",
    "invoice_items_attributes": [
        {
            "description": "Item description",
            "quantity": "5",
            "billing_start": "2020-11-01",
            "billing_end": "2020-11-03",
            "unit_type": "Hotel",
            "unit_cost_cents": "20000",
            "tax_type_id": "1"
        }
    ]
}
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({
    type: 'ItemisedInvoice',
    description: 'Invoice description',
    ccy: 'GBP',
    job_id: '137',
    due_on: '2020-11-01',
    dated_on: '2020-10-21',
    milestone_id: '78',
    net_total_cents: '100000',
    tax_total_cents: '20000',
    total_cents: '120000',
    invoice_items_attributes: [
      {
        description: 'Item description',
        quantity: '5',
        billing_start: '2020-11-01',
        billing_end: '2020-11-03',
        unit_type: 'Hotel',
        unit_cost_cents: '20000',
        tax_type_id: '1'
      }
    ]
  })
};

fetch('https://api.zivio.net/api/v3/invoices', 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/invoices",
  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([
    'type' => 'ItemisedInvoice',
    'description' => 'Invoice description',
    'ccy' => 'GBP',
    'job_id' => '137',
    'due_on' => '2020-11-01',
    'dated_on' => '2020-10-21',
    'milestone_id' => '78',
    'net_total_cents' => '100000',
    'tax_total_cents' => '20000',
    'total_cents' => '120000',
    'invoice_items_attributes' => [
        [
                'description' => 'Item description',
                'quantity' => '5',
                'billing_start' => '2020-11-01',
                'billing_end' => '2020-11-03',
                'unit_type' => 'Hotel',
                'unit_cost_cents' => '20000',
                'tax_type_id' => '1'
        ]
    ]
  ]),
  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/invoices"

	payload := strings.NewReader("{\n  \"type\": \"ItemisedInvoice\",\n  \"description\": \"Invoice description\",\n  \"ccy\": \"GBP\",\n  \"job_id\": \"137\",\n  \"due_on\": \"2020-11-01\",\n  \"dated_on\": \"2020-10-21\",\n  \"milestone_id\": \"78\",\n  \"net_total_cents\": \"100000\",\n  \"tax_total_cents\": \"20000\",\n  \"total_cents\": \"120000\",\n  \"invoice_items_attributes\": [\n    {\n      \"description\": \"Item description\",\n      \"quantity\": \"5\",\n      \"billing_start\": \"2020-11-01\",\n      \"billing_end\": \"2020-11-03\",\n      \"unit_type\": \"Hotel\",\n      \"unit_cost_cents\": \"20000\",\n      \"tax_type_id\": \"1\"\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/invoices")
  .header("X-API-Key", "<api-key>")
  .header("zivio-tenant-id", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"type\": \"ItemisedInvoice\",\n  \"description\": \"Invoice description\",\n  \"ccy\": \"GBP\",\n  \"job_id\": \"137\",\n  \"due_on\": \"2020-11-01\",\n  \"dated_on\": \"2020-10-21\",\n  \"milestone_id\": \"78\",\n  \"net_total_cents\": \"100000\",\n  \"tax_total_cents\": \"20000\",\n  \"total_cents\": \"120000\",\n  \"invoice_items_attributes\": [\n    {\n      \"description\": \"Item description\",\n      \"quantity\": \"5\",\n      \"billing_start\": \"2020-11-01\",\n      \"billing_end\": \"2020-11-03\",\n      \"unit_type\": \"Hotel\",\n      \"unit_cost_cents\": \"20000\",\n      \"tax_type_id\": \"1\"\n    }\n  ]\n}")
  .asString();

require 'uri'
require 'net/http'

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

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  \"type\": \"ItemisedInvoice\",\n  \"description\": \"Invoice description\",\n  \"ccy\": \"GBP\",\n  \"job_id\": \"137\",\n  \"due_on\": \"2020-11-01\",\n  \"dated_on\": \"2020-10-21\",\n  \"milestone_id\": \"78\",\n  \"net_total_cents\": \"100000\",\n  \"tax_total_cents\": \"20000\",\n  \"total_cents\": \"120000\",\n  \"invoice_items_attributes\": [\n    {\n      \"description\": \"Item description\",\n      \"quantity\": \"5\",\n      \"billing_start\": \"2020-11-01\",\n      \"billing_end\": \"2020-11-03\",\n      \"unit_type\": \"Hotel\",\n      \"unit_cost_cents\": \"20000\",\n      \"tax_type_id\": \"1\"\n    }\n  ]\n}"

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

{
  "id": "1",
  "status": "draft",
  "job_id": "23",
  "job_summary": "Some text about the project",
  "net_total": "16000.00",
  "tax_total": "2000.00",
  "total": "18000.00",
  "ccy": "GBP",
  "due_on": "2023-11-07T05:31:56Z",
  "dated_on": "2023-11-07T05:31:56Z",
  "milestone_id": "435",
  "line_item_sheet_id": "234",
  "credit_note_id": "124",
  "is_credit_note": "null",
  "credit_note_reason": "invoice paid in error",
  "created_at": "2023-11-07T05:31:56Z",
  "updated_at": "2023-11-07T05:31:56Z",
  "approved_at": "2023-11-07T05:31:56Z",
  "approved_by": {
    "id": "7158",
    "first_name": "Jack",
    "last_name": "Jones",
    "email": "jack_jones@example.com",
    "org_name": "Organisation Ltd",
    "org_id": "567",
    "business_unit": "Public Private Partnerships",
    "division": "Infastructure",
    "department": "Bridges",
    "vetting_status": "PASSED",
    "created_at": "2023-11-07T05:31:56Z",
    "updated_at": "2023-11-07T05:31:56Z",
    "custom_fields": {
      "key": "value"
    },
    "has_oversight": "<string>"
  },
  "client": {
    "id": "7158",
    "first_name": "Jack",
    "last_name": "Jones",
    "email": "jack_jones@example.com",
    "org_name": "Organisation Ltd",
    "org_id": "567",
    "business_unit": "Public Private Partnerships",
    "division": "Infastructure",
    "department": "Bridge Building",
    "vetting_status": "PASSED",
    "created_at": "2023-11-07T05:31:56Z",
    "updated_at": "2023-11-07T05:31:56Z",
    "custom_fields": {
      "key": "value"
    },
    "has_oversight": "<string>"
  },
  "client_org": {
    "id": "7158",
    "name": "Company Ltd",
    "is_external_client": "<string>",
    "created_at": "2023-11-07T05:31:56Z",
    "updated_at": "2023-11-07T05:31:56Z"
  },
  "supplier": {
    "id": "77",
    "name": "Company Inc",
    "email": "jack_jones@companyinc.com",
    "vetting_status": "PASSED",
    "tax_number": "9876543234",
    "tax_registered": "true",
    "created_at": "2023-11-07T05:31:56Z",
    "updated_at": "2023-11-07T05:31:56Z"
  }
}