Try implementing a shopping cart using Stripe, but what should it look like?

//checkout.php

$checkout_session = $stripe->checkout->sessions->create([
   'line_items' => [

    // foreach item listed in POST data,
    //  [],[],[],...

   ]
   'mode' => 'payment'
   'success_url' => $YOUR_DOMAIN . '/success.html',
   'cancel_url' => $YOUR_DOMAIN . '/cancel.html'
]);

Do I send everything the client wants in $_POST?

So I'm making a form on my domain?

Is there any other way to do this, where the customer can add to cart and continue shopping on my site, then checkout?

Any words of appreciation.