api.rb

require 'rubygems'
require 'curb'

# Create a new Curl instance with the correct accept and content-type headers
c = Curl::Easy.new do |curl|
  curl.headers["Accept"] = "application/json"
  curl.headers["Content-Type"] = "application/json"
  curl.http_auth_types = Curl::CURLAUTH_BASIC
  curl.userpwd = "username:password"
end

c.url = "http://subdomain.moneybird.nl/invoices.json"

# All information not supplied (like invoice_id, invoice_date and currency)
# are copied from the settings or other defaults are used.
new_invoice_json = '{
   "invoice":{
      "company_name":"TODO: Company",
      "details_attributes":[
         {
            "amount":"10",
            "description":"En nog eens 10 uur",
            "row_order":1
         },
         {
            "amount":"17",
            "description":"Zestien uur en drie kwartier met rowan gepraat",
            "row_order":2
         },
         {
            "amount":"2",
            "description":"Twee uur met rowan gepraat",
            "row_order":3
         }
      ]
   }
}'

# Create a post request
c.http_post(new_invoice_json)

# Check if the request is successfull
if c.response_code == 201
  puts "Created invoice successfully"
  puts c.body_str
else
  puts "Error creating invoice:"
  puts c.body_str
end

response

{
  "invoice": {
    "address1": null,
    "address2": null,
    "attention": null,
    "city": null,
    "company_name": "TODO: Company",
    "concept_id": 7,
    "contact_id": 8,
    "country": null,
    "created_at": "2014-01-08T08:46:01+01:00",
    "currency": "EUR",
    "customer_id": "8",
    "description": "We verzoeken u vriendelijk het bovenstaande bedrag van {document.total_price} voor {document.due_date} te voldoen op onze bankrekening onder vermelding van het factuurnummer {document.invoice_id}. Voor vragen kunt u contact opnemen per e-mail.",
    "discount": "0.0",
    "due_date_interval": 14,
    "exchange_rate": 1,
    "firstname": null,
    "id": 12,
    "invoice_date": "2014-01-08",
    "invoice_hash": "a72f9fbbefe4dd784f2a83afcdfe2b4c0de11927",
    "invoice_id": null,
    "invoice_profile_id": 1,
    "invoice_profile_version_id": null,
    "language": "en",
    "lastname": null,
    "original_estimate_id": null,
    "original_invoice_id": null,
    "po_number": null,
    "prices_are_incl_tax": false,
    "recurring_template_id": null,
    "send_method": "email",
    "show_customer_id": false,
    "show_tax": true,
    "show_tax_number": false,
    "state": "draft",
    "tax_number": null,
    "total_price_excl_tax": "0.0",
    "total_price_excl_tax_base": "0.0",
    "total_price_incl_tax": "0.0",
    "total_price_incl_tax_base": "0.0",
    "updated_at": "2014-01-08T08:46:01+01:00",
    "zipcode": null,
    "contact_name": "",
    "days_open": 0,
    "email": "",
    "invoice_email": "Geachte TODO: Company, \n\nIn de bijlage kunt u factuur {document.invoice_id} voor onze diensten vinden. Wij verzoeken u vriendelijk de factuur voor 22-01-2014 te voldoen.\n\nMet vriendelijke groet,\n\nParkietje B.V.",
    "invoice_email_reminder": "Geachte TODO: Company, \n\nIn de bijlage kunt u een herinnering voor factuur {document.invoice_id} vinden. Deze factuur is op 22-01-2014 verlopen, maar helaas hebben wij nog geen betaling ontvangen. Wij verzoeken u vriendelijk de factuur binnen vijf dagen te voldoen.\n\nMet vriendelijke groet,\n\nParkietje B.V.",
    "name": "TODO: Company",
    "pay_url": "https://parkietje.moneybird.dev/invoice/68466ae0a02dde8c1f524ea9416267a2b280feb3/a72f9fbbefe4dd784f2a83afcdfe2b4c0de11927/pay",
    "revision": 1389167161,
    "total_discount": "-0.0",
    "total_paid": 0,
    "total_tax": "0.0",
    "total_unpaid": "0.0",
    "url": "https://parkietje.moneybird.dev/invoice/68466ae0a02dde8c1f524ea9416267a2b280feb3/a72f9fbbefe4dd784f2a83afcdfe2b4c0de11927",
    "details": [
      {
        "amount": "10.0",
        "created_at": "2014-01-08T08:46:01+01:00",
        "description": "En nog eens 10 uur",
        "id": 28,
        "ledger_account_id": 12,
        "price": "0.0",
        "row_order": 1,
        "tax_rate_id": 6,
        "updated_at": "2014-01-08T08:46:01+01:00",
        "amount_plain": "10",
        "tax": "0.19",
        "total_price_excl_tax": "0.0",
        "total_price_incl_tax": "0.0"
      },
      {
        "amount": "17.0",
        "created_at": "2014-01-08T08:46:01+01:00",
        "description": "Zestien uur en drie kwartier met rowan gepraat",
        "id": 29,
        "ledger_account_id": 12,
        "price": "0.0",
        "row_order": 2,
        "tax_rate_id": 6,
        "updated_at": "2014-01-08T08:46:01+01:00",
        "amount_plain": "17",
        "tax": "0.19",
        "total_price_excl_tax": "0.0",
        "total_price_incl_tax": "0.0"
      },
      {
        "amount": "2.0",
        "created_at": "2014-01-08T08:46:01+01:00",
        "description": "Twee uur met rowan gepraat",
        "id": 30,
        "ledger_account_id": 12,
        "price": "0.0",
        "row_order": 3,
        "tax_rate_id": 6,
        "updated_at": "2014-01-08T08:46:01+01:00",
        "amount_plain": "2",
        "tax": "0.19",
        "total_price_excl_tax": "0.0",
        "total_price_incl_tax": "0.0"
      }
    ],
    "history": [
      {
        "action": "invoice_created",
        "created_at": "2014-01-08T08:46:01+01:00",
        "description": null,
        "id": 23,
        "updated_at": "2014-01-08T08:46:01+01:00",
        "user_id": null
      }
    ],
    "payments": []
  }
}