create_payment_intent.php

<?php
/*
Author:Minhazul Min
Website: https://minhazulmin.github.io/
 */

require_once 'stripe_header.php';

// Define the product item price and convert it to cents
$product_price = round( AMOUNT * 100 );

try {
    // Create PaymentIntent with amount, currency and description
    $paymentIntent = \Stripe\PaymentIntent::create( [
        'amount'               => $product_price,
        'currency'             => CURRENCY,
        'description'          => DESCRIPTION,
        'payment_method_types' => [
            'card',
        ],
    ] );

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

    echo json_encode( $output );
} catch ( Error $e ) {
    http_response_code( 500 );
    echo json_encode( ['error' => $e->getMessage()] );
}
?>