Stripe example PHP code

create.php

<?php

require 'vendor/autoload.php';

// This is a sample test API key. Sign in to see examples pre-filled with your key.
\Stripe\Stripe::setApiKey('sk_test_4eC39HqLyjWDarjtT1zdp7dc');

# retrieve JSON from POST body
header('Content-Type: application/json');
$json_str = file_get_contents('php://input');
$json_obj = json_decode($json_str);

function calculateOrderAmount($items) {
  // Replace this constant with a calculation of the order's amount
  // Calculate the order total on the server to prevent
  // customers from directly manipulating the amount on the client
  return 1400;
}

$paymentIntent = \Stripe\PaymentIntent::create([
  'amount' => calculateOrderAmount($json_obj->items),
  'currency' => 'usd',
]);

$output = [
  'clientSecret' => $paymentIntent->client_secret,
];

echo json_encode($output);