server.php

<?php
error_reporting(0);
ini_set('display_errors', 0);
require_once __DIR__ . '/vendor/autoload.php';

    
        $client = new \GuzzleHttp\Client();    
        $endereco = isset($_POST['endereco']) ? $_POST['endereco'] : '';

        $name = $_POST['holder-name'] ?? '';
        $document_type= $_POST['document_type'];
        $email = $_POST['email'] ?? ''; 
        $country_code= $_POST['country_code'] ?? '';
        $area_code= $_POST['area_code'] ?? '';
        $number= $_POST['number'] ?? '';
        $document= $_POST['document'] ?? '';
        $valor = $_POST['valor'] ?? '';
        $description = $_POST['nome'] ?? '';
        $installments= $_POST['installments'] ?? '';
        $code = $_POST['id'] ?? '';
        $payment_method= $_POST['visibility'];
        $descricao= $_POST['descricao'];
        $country= $_POST['country'];
        $state= $_POST['state'];
        $city= $_POST['city'];
        $zip_code= $_POST['zip_code'];
        $line_1= $_POST['line_1'];

        $responseShipping = $client->request('POST',
        'https://sandbox.melhorenvio.com.br/api/v2/me/shipment/calculate', [
          'body' => json_encode([
            "from"=>["postal_code"=>""],
              "to"=>["postal_code"=>$zip_code],
              "products"=>[
                ["id"=>$name,"width"=>23,"height"=>26,"weight"=>0.3,
                "insurance_value"=>$valor,"quantity"=>1]
                ]
              ]
            ),
          'headers' => [
            'Accept' => 'application/json',
            'Authorization' => 'Bearer ',
            'Content-Type' => 'application/json',
            'User-Agent' => 'Aplicação (email para contato técnico)',
          ],
        ]);

        echo $responseShipping->getBody();