curl --request POST \
  --url https://api.ipsofactura.com/empresas \
  --header 'Content-Type: application/json' \
  --header 'x-api: <api-key>' \
  --data '
{
  "rfc": "EKU9003173C9",
  "nombre_fiscal": "ESCUELA KEMPER URGATE",
  "regimen_fiscal": "601",
  "codigo_postal": "06000",
  "nombre_empresa": "Escuela Kemper Urgate"
}
'

import requests

url = "https://api.ipsofactura.com/empresas"

payload = {
    "rfc": "EKU9003173C9",
    "nombre_fiscal": "ESCUELA KEMPER URGATE",
    "regimen_fiscal": "601",
    "codigo_postal": "06000",
    "nombre_empresa": "Escuela Kemper Urgate"
}
headers = {
    "x-api": "<api-key>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {'x-api': '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    rfc: 'EKU9003173C9',
    nombre_fiscal: 'ESCUELA KEMPER URGATE',
    regimen_fiscal: '601',
    codigo_postal: '06000',
    nombre_empresa: 'Escuela Kemper Urgate'
  })
};

fetch('https://api.ipsofactura.com/empresas', 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.ipsofactura.com/empresas",
  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([
    'rfc' => 'EKU9003173C9',
    'nombre_fiscal' => 'ESCUELA KEMPER URGATE',
    'regimen_fiscal' => '601',
    'codigo_postal' => '06000',
    'nombre_empresa' => 'Escuela Kemper Urgate'
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "x-api: <api-key>"
  ],
]);

$response = curl_exec($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.ipsofactura.com/empresas"

	payload := strings.NewReader("{\n  \"rfc\": \"EKU9003173C9\",\n  \"nombre_fiscal\": \"ESCUELA KEMPER URGATE\",\n  \"regimen_fiscal\": \"601\",\n  \"codigo_postal\": \"06000\",\n  \"nombre_empresa\": \"Escuela Kemper Urgate\"\n}")

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

	req.Header.Add("x-api", "<api-key>")
	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.ipsofactura.com/empresas")
  .header("x-api", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"rfc\": \"EKU9003173C9\",\n  \"nombre_fiscal\": \"ESCUELA KEMPER URGATE\",\n  \"regimen_fiscal\": \"601\",\n  \"codigo_postal\": \"06000\",\n  \"nombre_empresa\": \"Escuela Kemper Urgate\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.ipsofactura.com/empresas")

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

request = Net::HTTP::Post.new(url)
request["x-api"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"rfc\": \"EKU9003173C9\",\n  \"nombre_fiscal\": \"ESCUELA KEMPER URGATE\",\n  \"regimen_fiscal\": \"601\",\n  \"codigo_postal\": \"06000\",\n  \"nombre_empresa\": \"Escuela Kemper Urgate\"\n}"

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

{
  "id": "a1b2c3d4-...",
  "rfc": "EKU9003173C9",
  "nombre_empresa": "Escuela Kemper Urgate",
  "nombre_fiscal": "ESCUELA KEMPER URGATE",
  "regimen_fiscal": "601",
  "codigo_postal": "06000",
  "es_activo": true
}

{
  "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "rfc": "<string>",
  "nombre_empresa": "<string>",
  "nombre_fiscal": "<string>",
  "regimen_fiscal": "<string>",
  "codigo_postal": "<string>",
  "es_activo": true
}

{
  "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "rfc": "<string>",
  "nombre_empresa": "<string>",
  "nombre_fiscal": "<string>",
  "regimen_fiscal": "<string>",
  "codigo_postal": "<string>",
  "es_activo": true
}