curl --request POST \
  --url https://json.ricardofuentes.dev/api/v1/facturacion/xml \
  --header 'Content-Type: application/json' \
  --data '
{
  "tipo": "<string>",
  "serie": "<string>",
  "numero": 123,
  "emisor": {
    "emisor.ruc": "<string>"
  },
  "receptor": {
    "receptor.ruc": "<string>"
  },
  "items": [
    {
      "items[].descripcion": "<string>",
      "items[].cantidad": 123,
      "items[].precio_unitario": 123,
      "items[].igv": 123
    }
  ]
}
'

import requests

url = "https://json.ricardofuentes.dev/api/v1/facturacion/xml"

payload = {
    "tipo": "<string>",
    "serie": "<string>",
    "numero": 123,
    "emisor": { "emisor.ruc": "<string>" },
    "receptor": { "receptor.ruc": "<string>" },
    "items": [
        {
            "items[].descripcion": "<string>",
            "items[].cantidad": 123,
            "items[].precio_unitario": 123,
            "items[].igv": 123
        }
    ]
}
headers = {"Content-Type": "application/json"}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {'Content-Type': 'application/json'},
  body: JSON.stringify({
    tipo: '<string>',
    serie: '<string>',
    numero: 123,
    emisor: {'emisor.ruc': '<string>'},
    receptor: {'receptor.ruc': '<string>'},
    items: [
      {
        'items[].descripcion': '<string>',
        'items[].cantidad': 123,
        'items[].precio_unitario': 123,
        'items[].igv': 123
      }
    ]
  })
};

fetch('https://json.ricardofuentes.dev/api/v1/facturacion/xml', 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://json.ricardofuentes.dev/api/v1/facturacion/xml",
  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([
    'tipo' => '<string>',
    'serie' => '<string>',
    'numero' => 123,
    'emisor' => [
        'emisor.ruc' => '<string>'
    ],
    'receptor' => [
        'receptor.ruc' => '<string>'
    ],
    'items' => [
        [
                'items[].descripcion' => '<string>',
                'items[].cantidad' => 123,
                'items[].precio_unitario' => 123,
                'items[].igv' => 123
        ]
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "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://json.ricardofuentes.dev/api/v1/facturacion/xml"

	payload := strings.NewReader("{\n  \"tipo\": \"<string>\",\n  \"serie\": \"<string>\",\n  \"numero\": 123,\n  \"emisor\": {\n    \"emisor.ruc\": \"<string>\"\n  },\n  \"receptor\": {\n    \"receptor.ruc\": \"<string>\"\n  },\n  \"items\": [\n    {\n      \"items[].descripcion\": \"<string>\",\n      \"items[].cantidad\": 123,\n      \"items[].precio_unitario\": 123,\n      \"items[].igv\": 123\n    }\n  ]\n}")

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

	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://json.ricardofuentes.dev/api/v1/facturacion/xml")
  .header("Content-Type", "application/json")
  .body("{\n  \"tipo\": \"<string>\",\n  \"serie\": \"<string>\",\n  \"numero\": 123,\n  \"emisor\": {\n    \"emisor.ruc\": \"<string>\"\n  },\n  \"receptor\": {\n    \"receptor.ruc\": \"<string>\"\n  },\n  \"items\": [\n    {\n      \"items[].descripcion\": \"<string>\",\n      \"items[].cantidad\": 123,\n      \"items[].precio_unitario\": 123,\n      \"items[].igv\": 123\n    }\n  ]\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://json.ricardofuentes.dev/api/v1/facturacion/xml")

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

request = Net::HTTP::Post.new(url)
request["Content-Type"] = 'application/json'
request.body = "{\n  \"tipo\": \"<string>\",\n  \"serie\": \"<string>\",\n  \"numero\": 123,\n  \"emisor\": {\n    \"emisor.ruc\": \"<string>\"\n  },\n  \"receptor\": {\n    \"receptor.ruc\": \"<string>\"\n  },\n  \"items\": [\n    {\n      \"items[].descripcion\": \"<string>\",\n      \"items[].cantidad\": 123,\n      \"items[].precio_unitario\": 123,\n      \"items[].igv\": 123\n    }\n  ]\n}"

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