curl --request POST \
  --url https://api.everhour.com/invoices/{invoice_id}/export \
  --header 'X-Api-Key: <api-key>'

import requests

url = "https://api.everhour.com/invoices/{invoice_id}/export"

headers = {"X-Api-Key": "<api-key>"}

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

print(response.text)

const options = {method: 'POST', headers: {'X-Api-Key': '<api-key>'}};

fetch('https://api.everhour.com/invoices/{invoice_id}/export', 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.everhour.com/invoices/{invoice_id}/export",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_HTTPHEADER => [
    "X-Api-Key: <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"
	"net/http"
	"io"
)

func main() {

	url := "https://api.everhour.com/invoices/{invoice_id}/export"

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

	req.Header.Add("X-Api-Key", "<api-key>")

	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.everhour.com/invoices/{invoice_id}/export")
  .header("X-Api-Key", "<api-key>")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.everhour.com/invoices/{invoice_id}/export")

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

request = Net::HTTP::Post.new(url)
request["X-Api-Key"] = '<api-key>'

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

{
  "id": 2660155,
  "client": {
    "id": 4567,
    "name": "Client Name",
    "projects": [
      "ev:1234567890"
    ],
    "businessDetails": "<string>",
    "budget": {
      "type": "money",
      "budget": 100000,
      "period": "general",
      "appliedFrom": "<string>",
      "disallowOverbudget": true,
      "excludeUnbillableTime": true,
      "excludeExpenses": true,
      "threshold": 123,
      "progress": 0
    }
  },
  "createdAt": "2018-01-16 12:42:59",
  "createdBy": {
    "id": 1304,
    "name": "User Name",
    "role": "admin",
    "status": "active",
    "headline": "CEO",
    "avatarUrl": "<string>",
    "phone": "<string>",
    "capacity": 123,
    "avatarUrlLarge": "<string>"
  },
  "status": "draft",
  "dateFrom": "<string>",
  "dateTill": "<string>",
  "dueDate": "<string>",
  "discount": {
    "amount": 4581,
    "rate": 25
  },
  "expenseMask": "%PROJECT% :: %CATEGORY%",
  "includeExpenses": true,
  "includeTime": true,
  "invoiceItems": [
    {
      "billedTime": 415860,
      "createdAt": "2017-02-22 16:11:33",
      "custom": false,
      "id": 52,
      "listAmount": 288793,
      "name": "Software Development",
      "netAmount": 288793,
      "position": 1,
      "taxable": 1,
      "totalAmount": 288793
    }
  ],
  "issueDate": "2019-03-22",
  "limitDateFrom": "<string>",
  "limitDateTill": "<string>",
  "listAmount": 18325,
  "netAmount": 13744,
  "projects": [
    "gh:63301595"
  ],
  "publicId": "1020",
  "tax": {
    "id": 123,
    "rate": 11,
    "amount": 1512
  },
  "timeMask": "%PROJECT%",
  "totalAmount": 15256,
  "totalTime": 43980,
  "valid": true
}