using InvoicingAPI.Nuget; // install the Nuget package by searching "InvoicingAPI"
                                                
var client = new InvoicingApiClient("__YOUR_API_KEY__");

// Replace with your actual invoice data. Check documentation below for more invoice parameters
var body = new CreateInvoiceBody
{
    Template = "business3",
    Color = "black",
    DocumentType = "letter",
    FontSize = 11,
    InvoiceNumber = "3345",
    IssueDate = DateTime.Now,
    DueDate = DateTime.Now,
    RecipientAddress = new Address
    {
        Name = "John Doe",
        Email = "johndoe@gmail.com",
        AddressLine1 = "John Keneddy Str",
        Telephone = "(034)-543-43354"
    },
    LineItems = new List
    {
        new LineItem
        {
            Description = "App consulting services", Quantity = 1, UnitPrice = 950
        }
    },
    Currency = "usd",
    Notes = "Payment Information\nIBAN Number: 43249423423489234",
    IsPaid = false
};

var result = await client.CreateInvoice(body);

if (result.InvoiceByteArray != null)
{
    File.WriteAllBytes($@"__PATH__\{result.FileName}", result.InvoiceByteArray);
}

import requests
import json

api_key = "__YOUR_API_KEY__"
api_url = "https://dev.invoicingapi.com/v1/invoice/createinvoice"

# Replace with your actual invoice data. Check documentation below for more invoice parameters
invoice_data = {
    "template": "business3",
    "color": "black",
    "documentType": "a4",
    "fontSize": 11,
    "invoiceNumber": "2024-44",
    "issueDate": "2024-01-11T09:18:54.092Z",
    "dueDate": "2024-05-11T09:18:54.092Z",
    "recipientAddress":{
        "name": "John Doe",
        "email": "johndoe@gmail.com",
        "addressLine1": "John Keneddy Str",
        "telephone": "(034)-543-43354"
    },
    "lineItems":[
        {
            "description": "App consulting services",
            "quantity": 1,
            "unitPrice": 950
        }
    ],
    "currency": "usd",
    "notes": "Payment Information\nIBAN Number: 43249423423489234",
    "isPaid": false
}

# Convert the invoice data to JSON format
invoice_json = json.dumps(invoice_data)

# Define the headers with the API key
headers = {
    "Content-Type": "application/json",
    "ApiKey": api_key,
}

# Make a POST request to the API
response = requests.post(api_url, data=invoice_json, headers=headers)

# Check if the request was successful (status code 200)
if response.status_code == 200:
    # Save it to a file
    with open("invoice.pdf", "wb") as pdf_file:
        pdf_file.write(response.content)
    print("Invoice PDF received and saved as 'invoice.pdf'")
else:
    print(f"API request failed with status code {response.status_code}")
    print(response.text)

$apiKey = '__YOUR_API_KEY__';
$apiUrl = 'https://dev.invoicingapi.com/v1/invoice/createinvoice';

// Replace with your actual invoice data. Check documentation below for more invoice parameters
$invoiceData = [
    "template" => "business3",
    "color" => "black",
    "documentType" => "a4",
    "fontSize" => 11,
    "invoiceNumber" => "2024-44",
    "issueDate" => "2024-01-11T09:18:54.092Z",
    "dueDate" => "2024-05-11T09:18:54.092Z",
    "recipientAddress" => array(
        "name" => "John Doe",
        "email" => "johndoe@gmail.com",
        "addressLine1" => "John Keneddy Str",
        "telephone" => "(034)-543-43354"
    ),
    "lineItems" => array(
        array(
            "description" => "App consulting services",
            "quantity" => 1,
            "unitPrice" => 950
        )
    ),
    "currency" => "usd",
    "notes" => "Payment Information\nIBAN Number: 43249423423489234",
    "isPaid" => false
];

// Convert the invoice data to JSON format
$invoiceJson = json_encode($invoiceData);

// Initialize cURL session
$ch = curl_init($apiUrl);

// Set cURL options
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, $invoiceJson);
curl_setopt($ch, CURLOPT_HTTPHEADER, [
    'Content-Type: application/json',
    'ApiKey: ' . $apiKey,
]);

// Execute cURL session and capture the response
$response = curl_exec($ch);

// Check for cURL errors
if (curl_errno($ch)) {
    echo 'cURL Error: ' . curl_error($ch);
    exit;
}

// Get the HTTP status code
$httpStatus = curl_getinfo($ch, CURLINFO_HTTP_CODE);

// Close cURL session
curl_close($ch);

// Check if the request was successful (status code 200)
if ($httpStatus === 200) {
    // Save the PDF response to a file
    file_put_contents('invoice.pdf', $response);
    echo 'Invoice PDF received and saved as "invoice.pdf"';
} else {
    echo 'API request failed with status code ' . $httpStatus . PHP_EOL;
    echo 'Response: ' . $response . PHP_EOL;
}

package main

import (
    "bytes"
    "fmt"
    "io/ioutil"
    "net/http"
)

func main() {
    apiKey := "__YOUR_API_KEY__"
    apiUrl := "https://dev.invoicingapi.com/v1/invoice/createinvoice"

    // Replace with your actual invoice data. Check documentation below for more invoice parameters
    invoiceData := `{
        "template": "business3",
        "color": "black",
        "documentType": "letter",
        "fontSize": 11,
        "invoiceNumber": "2024-44",
        "issueDate": "2024-01-11T09:18:54.092Z",
        "dueDate": "2024-05-11T09:18:54.092Z",
        "recipientAddress":{
            "name": "John Doe",
            "email": "johndoe@gmail.com",
            "addressLine1": "John Keneddy Str",
            "telephone": "(034)-543-43354"
        },
        "lineItems":[
            {
                "description": "App consulting services",
                "quantity": 1,
                "unitPrice": 950
            }
        ],
        "currency": "usd",
        "notes": "Payment Information\nIBAN Number: 43249423423489234",
        "isPaid": false
    }`

    // Create a request body with the invoice data
    requestBody := bytes.NewBuffer([]byte(invoiceData))

    // Create an HTTP client
    client := &http.Client{}

    // Create an HTTP POST request
    req, err := http.NewRequest("POST", apiUrl, requestBody)
    if err != nil {
        fmt.Println("Error creating request:", err)
        return
    }

    // Set request headers
    req.Header.Set("Content-Type", "application/json")
    req.Header.Set("ApiKey", apiKey)

    // Send the HTTP request
    resp, err := client.Do(req)
    if err != nil {
        fmt.Println("Error sending request:", err)
        return
    }
    defer resp.Body.Close()

    // Check if the request was successful (status code 200)
    if resp.StatusCode == http.StatusOK {
        // Read the response body (PDF content)
        pdfContent, err := ioutil.ReadAll(resp.Body)
        if err != nil {
            fmt.Println("Error reading response:", err)
            return
        }

        // Save the PDF content to a file
        err = ioutil.WriteFile("invoice.pdf", pdfContent, 0644)
        if err != nil {
            fmt.Println("Error saving PDF:", err)
            return
        }

        fmt.Println("Invoice PDF received and saved as 'invoice.pdf'")
    } else {
        fmt.Printf("API request failed with status code %d\n", resp.StatusCode)
        responseText, _ := ioutil.ReadAll(resp.Body)
        fmt.Println("Response:", string(responseText))
    }
}

import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;

public class InvoicingAPI {
    public static void main(String[] args) {
        String apiKey = "__YOUR_API_KEY__";
        String apiUrl = "https://dev.invoicingapi.com/v1/invoice/createinvoice";

        // Replace with your actual invoice data in JSON format. Check documentation below for more invoice parameters 
        String invoiceData = "{\"template\": \"business3\", " +
                "\"color\": \"black\", " +
                "\"documentType\": \"letter\", " +
                "\"fontSize\": 11, " +
                "\"invoiceNumber\": \"2024-44\", " +
                "\"issueDate\": \"2024-01-11T09:18:54.092Z\", " +
                "\"dueDate\": \"2024-05-11T09:18:54.092Z\", " +
                "\"recipientAddress\": {\"name\": \"John Doe\", " +
                "\"email\": \"johndoe@gmail.com\", " +
                "\"addressLine1\": \"John Keneddy Str\", " +
                "\"telephone\": \"(034)-543-43354\"}, " +
                "\"lineItems\": [{\"description\": \"App consulting services\", " +
                "\"quantity\": 1, " +
                "\"unitPrice\": 950}], " +
                "\"currency\": \"usd\", " +
                "\"notes\": \"Payment Information\\nIBAN Number: 43249423423489234\", " +
                "\"isPaid\": \"false\"}";

        try {
            // Create a URL object for the API endpoint
            URL url = new URL(apiUrl);

            // Open a connection to the URL
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();

            // Set the request method to POST
            connection.setRequestMethod("POST");

            // Set request headers
            connection.setRequestProperty("Content-Type", "application/json");
            connection.setRequestProperty("ApiKey", apiKey);

            // Enable input and output streams
            connection.setDoOutput(true);

            // Write the invoice data to the output stream
            try (OutputStream os = connection.getOutputStream()) {
                byte[] input = invoiceData.getBytes("utf-8");
                os.write(input, 0, input.length);
            }

            // Get the response code
            int responseCode = connection.getResponseCode();

            if (responseCode == HttpURLConnection.HTTP_OK) {
                // Read the response as an InputStream
                try (InputStream is = connection.getInputStream()) {
                    // Save the PDF response to a file
                    try (FileOutputStream fos = new FileOutputStream("invoice.pdf")) {
                        byte[] buffer = new byte[1024];
                        int bytesRead;
                        while ((bytesRead = is.read(buffer)) != -1) {
                            fos.write(buffer, 0, bytesRead);
                        }
                    }
                    System.out.println("Invoice PDF received and saved as 'invoice.pdf'");
                }
            } else {
                // Handle the error
                System.out.println("API request failed with status code " + responseCode);
                try (InputStream errorStream = connection.getErrorStream();
                     BufferedReader reader = new BufferedReader(new InputStreamReader(errorStream))) {
                    String line;
                    while ((line = reader.readLine()) != null) {
                        System.out.println(line);
                    }
                }
            }

            // Close the connection
            connection.disconnect();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}