Stripe checkout one-time payments php? - php

Question

I am trying to set Stripe checkout for my website.
I created and verified my Stripe account, and now I need to set up the checkout page. I downloaded from Github the PHP stripe library (I have PHP 5.6.4, so compatibility is OK). Then I went in the Stripe documentation and found this page.
I created a new page for the checkout, included the init.php from the Stripe library and pasted in the page the code found in the documentation page. When I open it, it gives back an empty page but I don't know why.
I don't know if this is the right procedure, but I searched online for like 2 hours finding nothing, and the documentation doesn't seem clear to me. Can someone help me?
I checked and the page doesn't generate errors. The code of the page is this:
<?php
require_once('assets/stripe/init.php');
\Stripe\Stripe::setApiKey('sk_test_OW6K5e96gNXbAhEvPo15IB3C');
$session = \Stripe\Checkout\Session::create([
'payment_method_types' => ['card'],
'line_items' => [[
'name' => 'T-shirt',
'description' => 'Comfortable cotton t-shirt',
'images' => ['https://example.com/t-shirt.png'],
'amount' => 500,
'currency' => 'eur',
'quantity' => 1,
]],
'success_url' => 'https://example.com/success?session_id={CHECKOUT_SESSION_ID}',
'cancel_url' => 'https://example.com/cancel',
]);
?>
This is what I copied in the page, still don't know if there's something to change or some other things to add.

Answer 1

<?php
require_once 'shared.php';
$domain_url = $config['domain'];
$base_price = $config['base_price'];
$currency = $config['currency'];
$quantity = $body->quantity;
// Create new Checkout Session for the order
// Other optional params include:
// [billing_address_collection] - to display billing address details on the page
// [customer] - if you have an existing Stripe Customer ID
// [payment_intent_data] - lets capture the payment later
// [customer_email] - lets you prefill the email input in the form
// For full details see https://stripe.com/docs/api/checkout/sessions/create
// ?session_id={CHECKOUT_SESSION_ID} means the redirect will have the session ID set as a query param
$checkout_session = \Stripe\Checkout\Session::create([
'success_url' => $domain_url . '/success.html?session_id={CHECKOUT_SESSION_ID}',
'cancel_url' => $domain_url . '/canceled.html',
'payment_method_types' => ['card'],
'line_items' => [[
'name' => 'Pasha photo',
'images' => ["https://picsum.photos/300/300?random=4"],
'quantity' => $quantity,
'amount' => $base_price,
'currency' => $currency
]]
]);
echo json_encode(['sessionId' => $checkout_session['id']]);
for more details and demo code :
https://github.com/stripe-samples/checkout-one-time-payments/tree/master/client-and-server/server/php/public