How do I send data with to json in PHP slim

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Javascript

PHP

Ruby

back-end

hi i was trying to convert code from ruby to PHP slim and want to send data from PHP slim with help of to Json

<pre lang="PHP"><pre>$app->get('/order-info', function (Request $request, Response $response) {
  $session = \Stripe\Checkout\Session::retrieve($request->get('session_id'));
  $customer = \Stripe\Customer::retrieve($session->customer);
  
  {
    session: session,
    customer: customer
  }.to_json

});

and in javascript to receive

<pre>document.addEventListener('DOMContentLoaded', async () => {
    var urlParams = new URLSearchParams(window.location.search);
    var sessionId = urlParams.get('session_id');
    
    if (sessionId) {
        const {customer, session} = 
            await fetch(`order-info?session_id=${sessionId}`)
                .then((r) => 
                r.json());
    }
    
});

Checkout 101: Build a custom order confirmation page with Checkout (Ruby) - YouTube[^]
this the link for reference what am I doing

What I have tried:

i have tried this maybe you can help me out if there is some mistake or need some changes to succeed

<pre><?php
  $app->get('/order-info', function (Request $request, Response $response) {
    $session = \Stripe\Checkout\Session::retrieve($request->get('session_id'));
    $customer = \Stripe\Customer::retrieve($session->customer);

    return $response->withJson([ 'session' => $session->session, 'customer' => $customer->customer]);

  });
?>