curl --request POST \
  --url https://api.everhour.com/clients \
  --header 'Content-Type: application/json' \
  --header 'X-Api-Key: <api-key>' \
  --data '
{
  "name": "Client Name",
  "projects": [
    "<string>"
  ],
  "lineItemMask": "<string>",
  "defaultTax": {
    "id": 123,
    "rate": 123
  },
  "defaultDiscount": 123,
  "paymentDueDays": 123,
  "reference": "<string>",
  "invoicePublicNotes": "<string>",
  "businessDetails": "<string>",
  "billingDetails": {
    "companyName": "<string>",
    "vatNumber": "<string>",
    "addressLine1": "<string>",
    "addressLine2": "<string>",
    "city": "<string>",
    "state": "<string>",
    "postcode": "<string>",
    "country": "<string>",
    "contactName": "<string>",
    "contactPhone": "<string>",
    "contactEmail": "<string>",
    "peppolEndpointId": "<string>",
    "peppolEndpointScheme": "<string>",
    "peppolMeansCode": "<string>",
    "bankAccountNumber": "<string>",
    "bankAccountRoutingNumber": "<string>",
    "bankAccountHolderName": "<string>"
  },
  "excludedLabels": [
    "<string>"
  ],
  "email": [
    "<string>"
  ]
}
'

import requests

url = "https://api.everhour.com/clients"

payload = {
    "name": "Client Name",
    "projects": ["<string>"],
    "lineItemMask": "<string>",
    "defaultTax": {
        "id": 123,
        "rate": 123
    },
    "defaultDiscount": 123,
    "paymentDueDays": 123,
    "reference": "<string>",
    "invoicePublicNotes": "<string>",
    "businessDetails": "<string>",
    "billingDetails": {
        "companyName": "<string>",
        "vatNumber": "<string>",
        "addressLine1": "<string>",
        "addressLine2": "<string>",
        "city": "<string>",
        "state": "<string>",
        "postcode": "<string>",
        "country": "<string>",
        "contactName": "<string>",
        "contactPhone": "<string>",
        "contactEmail": "<string>",
        "peppolEndpointId": "<string>",
        "peppolEndpointScheme": "<string>",
        "peppolMeansCode": "<string>",
        "bankAccountNumber": "<string>",
        "bankAccountRoutingNumber": "<string>",
        "bankAccountHolderName": "<string>"
    },
    "excludedLabels": ["<string>"],
    "email": ["<string>"]
}
headers = {
    "X-Api-Key": "<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>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    name: 'Client Name',
    projects: ['<string>'],
    lineItemMask: '<string>',
    defaultTax: {id: 123, rate: 123},
    defaultDiscount: 123,
    paymentDueDays: 123,
    reference: '<string>',
    invoicePublicNotes: '<string>',
    businessDetails: '<string>',
    billingDetails: {
      companyName: '<string>',
      vatNumber: '<string>',
      addressLine1: '<string>',
      addressLine2: '<string>',
      city: '<string>',
      state: '<string>',
      postcode: '<string>',
      country: '<string>',
      contactName: '<string>',
      contactPhone: '<string>',
      contactEmail: '<string>',
      peppolEndpointId: '<string>',
      peppolEndpointScheme: '<string>',
      peppolMeansCode: '<string>',
      bankAccountNumber: '<string>',
      bankAccountRoutingNumber: '<string>',
      bankAccountHolderName: '<string>'
    },
    excludedLabels: ['<string>'],
    email: ['<string>']
  })
};

fetch('https://api.everhour.com/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.everhour.com/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' => 'Client Name',
    'projects' => [
        '<string>'
    ],
    'lineItemMask' => '<string>',
    'defaultTax' => [
        'id' => 123,
        'rate' => 123
    ],
    'defaultDiscount' => 123,
    'paymentDueDays' => 123,
    'reference' => '<string>',
    'invoicePublicNotes' => '<string>',
    'businessDetails' => '<string>',
    'billingDetails' => [
        'companyName' => '<string>',
        'vatNumber' => '<string>',
        'addressLine1' => '<string>',
        'addressLine2' => '<string>',
        'city' => '<string>',
        'state' => '<string>',
        'postcode' => '<string>',
        'country' => '<string>',
        'contactName' => '<string>',
        'contactPhone' => '<string>',
        'contactEmail' => '<string>',
        'peppolEndpointId' => '<string>',
        'peppolEndpointScheme' => '<string>',
        'peppolMeansCode' => '<string>',
        'bankAccountNumber' => '<string>',
        'bankAccountRoutingNumber' => '<string>',
        'bankAccountHolderName' => '<string>'
    ],
    'excludedLabels' => [
        '<string>'
    ],
    'email' => [
        '<string>'
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "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"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://api.everhour.com/clients"

	payload := strings.NewReader("{\n  \"name\": \"Client Name\",\n  \"projects\": [\n    \"<string>\"\n  ],\n  \"lineItemMask\": \"<string>\",\n  \"defaultTax\": {\n    \"id\": 123,\n    \"rate\": 123\n  },\n  \"defaultDiscount\": 123,\n  \"paymentDueDays\": 123,\n  \"reference\": \"<string>\",\n  \"invoicePublicNotes\": \"<string>\",\n  \"businessDetails\": \"<string>\",\n  \"billingDetails\": {\n    \"companyName\": \"<string>\",\n    \"vatNumber\": \"<string>\",\n    \"addressLine1\": \"<string>\",\n    \"addressLine2\": \"<string>\",\n    \"city\": \"<string>\",\n    \"state\": \"<string>\",\n    \"postcode\": \"<string>\",\n    \"country\": \"<string>\",\n    \"contactName\": \"<string>\",\n    \"contactPhone\": \"<string>\",\n    \"contactEmail\": \"<string>\",\n    \"peppolEndpointId\": \"<string>\",\n    \"peppolEndpointScheme\": \"<string>\",\n    \"peppolMeansCode\": \"<string>\",\n    \"bankAccountNumber\": \"<string>\",\n    \"bankAccountRoutingNumber\": \"<string>\",\n    \"bankAccountHolderName\": \"<string>\"\n  },\n  \"excludedLabels\": [\n    \"<string>\"\n  ],\n  \"email\": [\n    \"<string>\"\n  ]\n}")

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

	req.Header.Add("X-Api-Key", "<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.everhour.com/clients")
  .header("X-Api-Key", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"name\": \"Client Name\",\n  \"projects\": [\n    \"<string>\"\n  ],\n  \"lineItemMask\": \"<string>\",\n  \"defaultTax\": {\n    \"id\": 123,\n    \"rate\": 123\n  },\n  \"defaultDiscount\": 123,\n  \"paymentDueDays\": 123,\n  \"reference\": \"<string>\",\n  \"invoicePublicNotes\": \"<string>\",\n  \"businessDetails\": \"<string>\",\n  \"billingDetails\": {\n    \"companyName\": \"<string>\",\n    \"vatNumber\": \"<string>\",\n    \"addressLine1\": \"<string>\",\n    \"addressLine2\": \"<string>\",\n    \"city\": \"<string>\",\n    \"state\": \"<string>\",\n    \"postcode\": \"<string>\",\n    \"country\": \"<string>\",\n    \"contactName\": \"<string>\",\n    \"contactPhone\": \"<string>\",\n    \"contactEmail\": \"<string>\",\n    \"peppolEndpointId\": \"<string>\",\n    \"peppolEndpointScheme\": \"<string>\",\n    \"peppolMeansCode\": \"<string>\",\n    \"bankAccountNumber\": \"<string>\",\n    \"bankAccountRoutingNumber\": \"<string>\",\n    \"bankAccountHolderName\": \"<string>\"\n  },\n  \"excludedLabels\": [\n    \"<string>\"\n  ],\n  \"email\": [\n    \"<string>\"\n  ]\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.everhour.com/clients")

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["Content-Type"] = 'application/json'
request.body = "{\n  \"name\": \"Client Name\",\n  \"projects\": [\n    \"<string>\"\n  ],\n  \"lineItemMask\": \"<string>\",\n  \"defaultTax\": {\n    \"id\": 123,\n    \"rate\": 123\n  },\n  \"defaultDiscount\": 123,\n  \"paymentDueDays\": 123,\n  \"reference\": \"<string>\",\n  \"invoicePublicNotes\": \"<string>\",\n  \"businessDetails\": \"<string>\",\n  \"billingDetails\": {\n    \"companyName\": \"<string>\",\n    \"vatNumber\": \"<string>\",\n    \"addressLine1\": \"<string>\",\n    \"addressLine2\": \"<string>\",\n    \"city\": \"<string>\",\n    \"state\": \"<string>\",\n    \"postcode\": \"<string>\",\n    \"country\": \"<string>\",\n    \"contactName\": \"<string>\",\n    \"contactPhone\": \"<string>\",\n    \"contactEmail\": \"<string>\",\n    \"peppolEndpointId\": \"<string>\",\n    \"peppolEndpointScheme\": \"<string>\",\n    \"peppolMeansCode\": \"<string>\",\n    \"bankAccountNumber\": \"<string>\",\n    \"bankAccountRoutingNumber\": \"<string>\",\n    \"bankAccountHolderName\": \"<string>\"\n  },\n  \"excludedLabels\": [\n    \"<string>\"\n  ],\n  \"email\": [\n    \"<string>\"\n  ]\n}"

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

{
  "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
  }
}