curl --request GET \
  --url 'https://api.cnpja.com.br/companies/*CNPJ*' \
  --header 'authorization: *CHAVE-DE-API*'

<?php

$curl = curl_init();

curl_setopt_array($curl, array(
  CURLOPT_URL => "https://api.cnpja.com.br/companies/*CNPJ*",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "GET",
  CURLOPT_HTTPHEADER => array(
    "authorization: *CHAVE-DE-API*"
  ),
));

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

<?php

$request = new HttpRequest();
$request->setUrl('https://api.cnpja.com.br/companies/*CNPJ*');
$request->setMethod(HTTP_METH_GET);

$request->setHeaders(array(
  'authorization' => '*CHAVE-DE-API*'
));

try {
  $response = $request->send();

  echo $response->getBody();
} catch (HttpException $ex) {
  echo $ex;
}

<?php

$client = new http\Client;
$request = new http\Client\Request;

$request->setRequestUrl('https://api.cnpja.com.br/companies/*CNPJ*');
$request->setRequestMethod('GET');
$request->setHeaders(array(
  'authorization' => '*CHAVE-DE-API*'
));

$client->enqueue($request)->send();
$response = $client->getResponse();

echo $response->getBody();

var settings = {
  "async": true,
  "crossDomain": true,
  "url": "https://api.cnpja.com.br/companies/*CNPJ*",
  "method": "GET",
  "headers": {
    "authorization": "*CHAVE-DE-API*"
  }
}

$.ajax(settings).done(function (response) {
  console.log(response);
});

fetch("https://api.cnpja.com.br/companies/*CNPJ*", {
  "method": "GET",
  "headers": {
    "authorization": "*CHAVE-DE-API*"
  }
})
.then(response => {
  console.log(response);
})
.catch(err => {
  console.log(err);
});

var data = null;

var xhr = new XMLHttpRequest();
xhr.withCredentials = true;

xhr.addEventListener("readystatechange", function () {
  if (this.readyState === this.DONE) {
    console.log(this.responseText);
  }
});

xhr.open("GET", "https://api.cnpja.com.br/companies/*CNPJ*");
xhr.setRequestHeader("authorization", "*CHAVE-DE-API*");

xhr.send(data);

var request = require("request");

var options = {
  method: 'GET',
  url: 'https://api.cnpja.com.br/companies/*CNPJ*',
  headers: {authorization: '*CHAVE-DE-API*'}
};

request(options, function (error, response, body) {
  if (error) throw new Error(error);

  console.log(body);
});

var unirest = require("unirest");

var req = unirest("GET", "https://api.cnpja.com.br/companies/*CNPJ*");

req.headers({
  "authorization": "*CHAVE-DE-API*"
});


req.end(function (res) {
  if (res.error) throw new Error(res.error);

  console.log(res.body);
});

var http = require("https");

var options = {
  "method": "GET",
  "hostname": "api.cnpja.com.br",
  "port": null,
  "path": "/companies/*CNPJ*",
  "headers": {
    "authorization": "*CHAVE-DE-API*"
  }
};

var req = http.request(options, function (res) {
  var chunks = [];

  res.on("data", function (chunk) {
    chunks.push(chunk);
  });

  res.on("end", function () {
    var body = Buffer.concat(chunks);
    console.log(body.toString());
  });
});

req.end();

import requests

url = "https://api.cnpja.com.br/companies/*CNPJ*"

headers = {'authorization': '*CHAVE-DE-API*'}

response = requests.request("GET", url, headers=headers)

print(response.text)

import http.client

conn = http.client.HTTPSConnection("api.cnpja.com.br")

headers = { 'authorization': "*CHAVE-DE-API*" }

conn.request("GET", "/companies/*CNPJ*", headers=headers)

res = conn.getresponse()
data = res.read()

print(data.decode("utf-8"))

OkHttpClient client = new OkHttpClient();

Request request = new Request.Builder()
  .url("https://api.cnpja.com.br/companies/*CNPJ*")
  .get()
  .addHeader("authorization", "*CHAVE-DE-API*")
  .build();

Response response = client.newCall(request).execute();

HttpResponse<String> response = Unirest.get("https://api.cnpja.com.br/companies/*CNPJ*")
  .header("authorization", "*CHAVE-DE-API*")
  .asString();