Stripe: can't create session - php

Question

I want to implement a paiement in Stripe using Checkout in server side.
I followed their tutorial but I can't return the id.
I used the following code, just added echo 1,2,3... to check where there is a problem.
When I execute the following code I just return "1".
(of course I have created an account on Stripe)
<?php
echo "1";
\Stripe\Stripe::setApiKey('sk_test_XXXXXXXXXXXXXXXXXXXX');
echo "2";
$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',
'cancel_url' => 'https://example.com/cancel',
]);
echo "3";
$session_id = $object->id;
echo "4";
if ($session_id) {
echo "sessionID OK";
} else {
echo "No Session ID!";
}
echo "5";
?>
Do you know what is wrong ?

Answer 1

I cant see that you import the stripe library.
The go to way to do this is via composer.
If you already have composer you run composer require stripe
If not: install composer from https://getcomposer.org
And then include the path to the generated autoload.php file like this: require "/path/to/vendor/autoload.php";
You could check here for offical stripe docs (referencing what i have said): https://stripe.com/docs/development#php