Sind Sie sicher, dass Ihre Kunden Sie auch morgen noch bezahlen können?

    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, 'https://www.bilendo.de/api/v1/invoices');
    curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'POST');
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_HTTPHEADER, ["Authorization: Token token=YOUR-API-TOKEN"]);
    $body = [
        'customer[name]'     => 'New Company Inc.',
        'contact[name]'      => 'John Smith',
        'invoice'            => new CurlFile('invoice.pdf', 'application/pdf'),
        'invoice_attachment' => new CurlFile('attachment.pdf', 'application/pdf'),
    ];
    curl_setopt($ch, CURLOPT_POST, 1);
    curl_setopt($ch, CURLOPT_POSTFIELDS, $body);
    $resp = curl_exec($ch);

    require 'net/http'
    require 'net/https'
    require 'net/http/post/multipart'
    uri = URI('https://www.bilendo.de/api/v1/invoices')

    http = Net::HTTP.new(uri.host, uri.port)
    http.use_ssl = true
    http.verify_mode = OpenSSL::SSL::VERIFY_PEER

    body = {
        'customer[name]'     => 'New Company Inc.',
        'contact[name]'      => 'John Smith',
        'invoice'            => UploadIO.new(File.new('invoice.pdf'), 'application/pdf'),
        'invoice_attachment' => UploadIO.new(File.new('attachment.pdf'), 'application/pdf')
    }
    req = Net::HTTP::Post::Multipart.new(uri, body)
    req.add_field 'Authorization', 'Token token=YOUR-API-TOKEN'

    res = http.request(req)

    import requests

    response = requests.post(
        url = 'https://www.bilendo.de/api/v1/invoices',
        headers = {
            'Authorization': 'Token token=YOUR-API-TOKEN'
        },
        files = {
            'invoice':            open('invoice.pdf', 'rb'),
            'invoice_attachment': open('attachment.pdf', 'rb')
        },
        data = {
            'customer[name]': 'New Company Inc',
            'contact[name]':  'John Smith'
        }
    )