PHP

<?php

require 'vendor/autoload.php';

$headers = array(
    'Content-Type' => 'application/json',
    'Accept' => 'application/json',
    'Callback' => 'string',
    'Authorization' => 'Bearer ' . $chave-api,
);

$client = new \GuzzleHttp\Client();

// Define array of request body.
$request_body = array(
    'cpfCnpj' => '999.999.999-99',
);

try {
    $response = $client->request('POST',$url, array(
        'headers' => $headers,
        'json' => $request_body,
       )
    );
    print_r($response->getBody()->getContents());
 }
 catch (\GuzzleHttp\Exception\BadResponseException $e) {
    // handle exception or api errors.
    print_r($e->getMessage());
 }

 // ...