curl --request POST \
  --url https://api.finseed.es/v1/invoices \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "line_items": [
    {
      "description": "Consulting services",
      "quantity": 2,
      "unit_amount": 4150,
      "tax": {
        "type": "vat",
        "rate": 21
      }
    }
  ],
  "type": "complete",
  "external_id": "order-84312",
  "number_series_id": "ns_clx456def789",
  "operation_date": "2025-06-15",
  "recargo_equivalencia": false,
  "footer_notes": "Pago a 30 días."
}
'

import requests

url = "https://api.finseed.es/v1/invoices"

payload = {
    "line_items": [
        {
            "description": "Consulting services",
            "quantity": 2,
            "unit_amount": 4150,
            "tax": {
                "type": "vat",
                "rate": 21
            }
        }
    ],
    "type": "complete",
    "external_id": "order-84312",
    "number_series_id": "ns_clx456def789",
    "operation_date": "2025-06-15",
    "recargo_equivalencia": False,
    "footer_notes": "Pago a 30 días."
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    line_items: [
      {
        description: 'Consulting services',
        quantity: 2,
        unit_amount: 4150,
        tax: {type: 'vat', rate: 21}
      }
    ],
    type: 'complete',
    external_id: 'order-84312',
    number_series_id: 'ns_clx456def789',
    operation_date: '2025-06-15',
    recargo_equivalencia: false,
    footer_notes: 'Pago a 30 días.'
  })
};

fetch('https://api.finseed.es/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.finseed.es/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([
    'line_items' => [
        [
                'description' => 'Consulting services',
                'quantity' => 2,
                'unit_amount' => 4150,
                'tax' => [
                                'type' => 'vat',
                                'rate' => 21
                ]
        ]
    ],
    'type' => 'complete',
    'external_id' => 'order-84312',
    'number_series_id' => 'ns_clx456def789',
    'operation_date' => '2025-06-15',
    'recargo_equivalencia' => false,
    'footer_notes' => 'Pago a 30 días.'
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($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.finseed.es/v1/invoices"

	payload := strings.NewReader("{\n  \"line_items\": [\n    {\n      \"description\": \"Consulting services\",\n      \"quantity\": 2,\n      \"unit_amount\": 4150,\n      \"tax\": {\n        \"type\": \"vat\",\n        \"rate\": 21\n      }\n    }\n  ],\n  \"type\": \"complete\",\n  \"external_id\": \"order-84312\",\n  \"number_series_id\": \"ns_clx456def789\",\n  \"operation_date\": \"2025-06-15\",\n  \"recargo_equivalencia\": false,\n  \"footer_notes\": \"Pago a 30 días.\"\n}")

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

	req.Header.Add("Authorization", "Bearer <token>")
	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.finseed.es/v1/invoices")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"line_items\": [\n    {\n      \"description\": \"Consulting services\",\n      \"quantity\": 2,\n      \"unit_amount\": 4150,\n      \"tax\": {\n        \"type\": \"vat\",\n        \"rate\": 21\n      }\n    }\n  ],\n  \"type\": \"complete\",\n  \"external_id\": \"order-84312\",\n  \"number_series_id\": \"ns_clx456def789\",\n  \"operation_date\": \"2025-06-15\",\n  \"recargo_equivalencia\": false,\n  \"footer_notes\": \"Pago a 30 días.\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.finseed.es/v1/invoices")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"line_items\": [\n    {\n      \"description\": \"Consulting services\",\n      \"quantity\": 2,\n      \"unit_amount\": 4150,\n      \"tax\": {\n        \"type\": \"vat\",\n        \"rate\": 21\n      }\n    }\n  ],\n  \"type\": \"complete\",\n  \"external_id\": \"order-84312\",\n  \"number_series_id\": \"ns_clx456def789\",\n  \"operation_date\": \"2025-06-15\",\n  \"recargo_equivalencia\": false,\n  \"footer_notes\": \"Pago a 30 días.\"\n}"

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