function calcularFrete($cepDestino){

    $data = [
        "from" => ["postal_code" => "16000000"], // seu CEP
        "to" => ["postal_code" => $cepDestino],
        "package" => [
            "height" => 4,
            "width" => 12,
            "length" => 18,
            "weight" => 0.3
        ]
    ];

    $ch = curl_init("https://sandbox.melhorenvio.com.br/api/v2/me/shipment/calculate");
    curl_setopt_array($ch, [
        CURLOPT_RETURNTRANSFER => true,
        CURLOPT_POST => true,
        CURLOPT_POSTFIELDS => json_encode($data),
        CURLOPT_HTTPHEADER => [
            "Authorization: Bearer " . MELHOR_ENVIO_TOKEN,
            "Content-Type: application/json"
        ]
    ]);

    $response = json_decode(curl_exec($ch), true);
    curl_close($ch);

    return $response;
}function criarPixAsaas($order){
    $data = [
        "customer" => null,
        "billingType" => "PIX",
        "value" => (float)$order['total'],
        "description" => "Pedido MTH #" . $order['id']
    ];

    $ch = curl_init(ASAAS_URL . "/payments");
    curl_setopt_array($ch, [
        CURLOPT_RETURNTRANSFER => true,
        CURLOPT_POST => true,
        CURLOPT_POSTFIELDS => json_encode($data),
        CURLOPT_HTTPHEADER => [
            "Content-Type: application/json",
            "access_token: " . ASAAS_API_KEY
        ]
    ]);

    $response = json_decode(curl_exec($ch), true);
    curl_close($ch);

    return $response;
}Produto inválido