PHP - Retrieve existing stripe customer and their cards? - php

Question

I'm successfully able to create a new customer in Stripe via my PHP backend. That being said, when my user wants to view their existing cards, the PHP below just creates another new user and ephemeral key. If I already have a customer ID, how can I change my below code to make it so that if I'm providing the customer ID, existing cards are returned? Help is greatly appreciated!
if (!isset($_POST['api_version']))
{
header('HTTP/1.1 400 Bad Request');
}
//USER DETAILS
$email = $_POST['email'];
$customer = \Stripe\Customer::create(array(
'email' => $email,
));
try {
$key = \Stripe\EphemeralKey::create(
["customer" => $customer->id],
["stripe_version" => $_POST['api_version']]
);
header('Content-Type: application/json');
exit(json_encode($key));
} catch (Exception $e) {
header('HTTP/1.1 500 Internal Server Error');
}

Answer 1

You need to store the customer id you get back from stripe the first time you create a customer and then you can retrieve the user with:
\Stripe\Customer::retrieve($customer_id);
Something like this:
$customer_id = $_POST['customer_id']; //get this id from somewhere a database table, post parameter, etc.
// if the customer id doesn't exist create the customer
if ($customer_id !== null) {
// create the customer as you are now
} else {
$cards = \Stripe\Customer::retrieve($customer_id)->sources->all()
// return the cards
}