curl --request POST \
  --url https://api.heffl.com/api/v1/invoices \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '
{
  "clientId": "<string>",
  "date": "2023-11-07T05:31:56Z",
  "dueDate": "2023-11-07T05:31:56Z",
  "lineItems": [
    {
      "name": "<string>",
      "productId": "<string>",
      "quantity": 0,
      "price": 0,
      "description": "<string>",
      "taxRateId": "<string>",
      "discount": 0,
      "discountType": "fixed",
      "buyPrice": 0
    }
  ],
  "isInclusiveTax": false,
  "status": "DRAFT",
  "contactId": "<string>",
  "subject": "<string>",
  "notes": "<string>",
  "salesPersonId": "<string>",
  "templateId": "<string>",
  "tags": []
}
'

import requests

url = "https://api.heffl.com/api/v1/invoices"

payload = {
    "clientId": "<string>",
    "date": "2023-11-07T05:31:56Z",
    "dueDate": "2023-11-07T05:31:56Z",
    "lineItems": [
        {
            "name": "<string>",
            "productId": "<string>",
            "quantity": 0,
            "price": 0,
            "description": "<string>",
            "taxRateId": "<string>",
            "discount": 0,
            "discountType": "fixed",
            "buyPrice": 0
        }
    ],
    "isInclusiveTax": False,
    "status": "DRAFT",
    "contactId": "<string>",
    "subject": "<string>",
    "notes": "<string>",
    "salesPersonId": "<string>",
    "templateId": "<string>",
    "tags": []
}
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({
    clientId: '<string>',
    date: '2023-11-07T05:31:56Z',
    dueDate: '2023-11-07T05:31:56Z',
    lineItems: [
      {
        name: '<string>',
        productId: '<string>',
        quantity: 0,
        price: 0,
        description: '<string>',
        taxRateId: '<string>',
        discount: 0,
        discountType: 'fixed',
        buyPrice: 0
      }
    ],
    isInclusiveTax: false,
    status: 'DRAFT',
    contactId: '<string>',
    subject: '<string>',
    notes: '<string>',
    salesPersonId: '<string>',
    templateId: '<string>',
    tags: []
  })
};

fetch('https://api.heffl.com/api/v1/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.heffl.com/api/v1/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([
    'clientId' => '<string>',
    'date' => '2023-11-07T05:31:56Z',
    'dueDate' => '2023-11-07T05:31:56Z',
    'lineItems' => [
        [
                'name' => '<string>',
                'productId' => '<string>',
                'quantity' => 0,
                'price' => 0,
                'description' => '<string>',
                'taxRateId' => '<string>',
                'discount' => 0,
                'discountType' => 'fixed',
                'buyPrice' => 0
        ]
    ],
    'isInclusiveTax' => false,
    'status' => 'DRAFT',
    'contactId' => '<string>',
    'subject' => '<string>',
    'notes' => '<string>',
    'salesPersonId' => '<string>',
    'templateId' => '<string>',
    'tags' => [
        
    ]
  ]),
  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.heffl.com/api/v1/invoices"

	payload := strings.NewReader("{\n  \"clientId\": \"<string>\",\n  \"date\": \"2023-11-07T05:31:56Z\",\n  \"dueDate\": \"2023-11-07T05:31:56Z\",\n  \"lineItems\": [\n    {\n      \"name\": \"<string>\",\n      \"productId\": \"<string>\",\n      \"quantity\": 0,\n      \"price\": 0,\n      \"description\": \"<string>\",\n      \"taxRateId\": \"<string>\",\n      \"discount\": 0,\n      \"discountType\": \"fixed\",\n      \"buyPrice\": 0\n    }\n  ],\n  \"isInclusiveTax\": false,\n  \"status\": \"DRAFT\",\n  \"contactId\": \"<string>\",\n  \"subject\": \"<string>\",\n  \"notes\": \"<string>\",\n  \"salesPersonId\": \"<string>\",\n  \"templateId\": \"<string>\",\n  \"tags\": []\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.heffl.com/api/v1/invoices")
  .header("x-api-key", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"clientId\": \"<string>\",\n  \"date\": \"2023-11-07T05:31:56Z\",\n  \"dueDate\": \"2023-11-07T05:31:56Z\",\n  \"lineItems\": [\n    {\n      \"name\": \"<string>\",\n      \"productId\": \"<string>\",\n      \"quantity\": 0,\n      \"price\": 0,\n      \"description\": \"<string>\",\n      \"taxRateId\": \"<string>\",\n      \"discount\": 0,\n      \"discountType\": \"fixed\",\n      \"buyPrice\": 0\n    }\n  ],\n  \"isInclusiveTax\": false,\n  \"status\": \"DRAFT\",\n  \"contactId\": \"<string>\",\n  \"subject\": \"<string>\",\n  \"notes\": \"<string>\",\n  \"salesPersonId\": \"<string>\",\n  \"templateId\": \"<string>\",\n  \"tags\": []\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.heffl.com/api/v1/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["Content-Type"] = 'application/json'
request.body = "{\n  \"clientId\": \"<string>\",\n  \"date\": \"2023-11-07T05:31:56Z\",\n  \"dueDate\": \"2023-11-07T05:31:56Z\",\n  \"lineItems\": [\n    {\n      \"name\": \"<string>\",\n      \"productId\": \"<string>\",\n      \"quantity\": 0,\n      \"price\": 0,\n      \"description\": \"<string>\",\n      \"taxRateId\": \"<string>\",\n      \"discount\": 0,\n      \"discountType\": \"fixed\",\n      \"buyPrice\": 0\n    }\n  ],\n  \"isInclusiveTax\": false,\n  \"status\": \"DRAFT\",\n  \"contactId\": \"<string>\",\n  \"subject\": \"<string>\",\n  \"notes\": \"<string>\",\n  \"salesPersonId\": \"<string>\",\n  \"templateId\": \"<string>\",\n  \"tags\": []\n}"

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

{
  "id": "<string>",
  "number": "<string>",
  "date": "2023-11-07T05:31:56Z",
  "dueDate": "2023-11-07T05:31:56Z",
  "status": "<string>",
  "currency": "<string>",
  "isInclusiveTax": true,
  "subTotal": 123,
  "taxTotal": 123,
  "discountTotal": 123,
  "total": 123,
  "pendingTotal": 123,
  "paidTotal": 123,
  "lineItems": [
    {
      "name": "<string>",
      "quantity": 123,
      "price": 123,
      "tax": 123,
      "discount": 123,
      "buyPrice": 123,
      "amount": 123,
      "taxAmount": 123,
      "discountAmount": 123,
      "description": "<string>",
      "productId": 123
    }
  ],
  "createdAt": "2023-11-07T05:31:56Z",
  "clientId": "<string>",
  "contactId": "<string>",
  "subject": "<string>",
  "notes": "<string>",
  "salesPersonId": 123,
  "customFields": {}
}