Cloud function for forwarding request to whatsapp API

function.php

use Psr\Http\Message\ServerRequestInterface;

function product(ServerRequestInterface $request)
{
    $name = "Banana";
    $phoneNumber = "62812334444"
    $queryString = $request->getQueryParams();
    $name = $queryString['name'] ?? $name;

    header("Location: https://api.whatsapp.com/send?phone=" . $phoneNumber . "&text=" . $name);
    die();
}