Stripe Payment Gateway - Variable Amounts - php

Question

I have found lots of questions for this topic, but none seems to answer my question...
NB. Using Larry Ullman's Blog at http://www.larryullman.com/2012/11/28/creating-a-form-for-handling-payments-with-stripe/
Trying to use
$amount = $_REQUEST['amount'];
instead of
$amount = 23400; //EXAMPLE ONLY
But the value of $_REQUEST['amount']; is being ignored?
<?php
// Check for a form submission:
if ($_SERVER['REQUEST_METHOD'] == 'POST') {
// Stores errors:
$errors = array();
// Need a payment token:
if (isset($_POST['stripeToken'])) {
$token = $_POST['stripeToken'];
$StripeAmount = $_REQUEST['amount']; // $20, in cents
// Check for a duplicate submission, just in case:
// Uses sessions, you could use a cookie instead.
if (isset($_SESSION['token']) && ($_SESSION['token'] == $token)) {
$errors['token'] = 'You have apparently resubmitted the form. Please do not do that.';
} else { // New submission.
$_SESSION['token'] = $token;
}
} else {
$errors['token'] = 'The order cannot be processed. Please make sure you have JavaScript enabled and try again.';
}
// Set the order amount somehow:
// $20, in cents
$amount = $_REQUEST['amount']; // in cents
// Validate other form data!
// If no errors, process the order:
if (empty($errors)) {
// create the charge on Stripe's servers - this will charge the user's card
try {
// Include the Stripe library:
// Assumes you've installed the Stripe PHP library using Composer!
require_once('stripe/init.php');
// set your secret key: remember to change this to your live secret key in production
// see your keys here https://manage.stripe.com/account
\Stripe\Stripe::setApiKey(STRIPE_PRIVATE_KEY);
// Charge the order:
$charge = \Stripe\Charge::create(array(
"amount" => $amount, // amount in cents, again
"currency" => "aud",
"source" => $token,
"description" => $email
)
);
// Check that it was paid:
if ($charge->paid == true) {
$OrderID = $_GET['order_id']; //reference from shop OrderId
$txn_id = $_GET['id']; //transaction number form payment Gateway
$objBooking->updateVisitorOrderRecord($OrderID, $txn_id);
header('location:visitor_payment_thanks.php');
} else { // Charge was not paid!
header('location:visitor_payment_error.php');
}
} catch (\Stripe\Error\Card $e) {
// Card was declined.
$e_json = $e->getJsonBody();
$err = $e_json['error'];
$errors['stripe'] = $err['message'];
} catch (\Stripe\Error\ApiConnection $e) {
// Network problem, perhaps try again.
} catch (\Stripe\Error\InvalidRequest $e) {
// You screwed up in your programming. Shouldn't happen!
} catch (\Stripe\Error\Api $e) {
// Stripe's servers are down!
} catch (\Stripe\Error\Base $e) {
// Something else that's not the customer's fault.
}
} // A user form submission error occurred, handled below.
} // Form submission.
// Set the Stripe key:
// Uses STRIPE_PUBLIC_KEY from the config file.
echo '<script type="text/javascript">Stripe.setPublishableKey("' . STRIPE_PUBLIC_KEY . '");</script>';
?>
<h1>Buy This Thing</h1>
<form action="buy.php" method="POST" id="payment-form">
<?php // Show PHP errors, if they exist:
if (isset($errors) && !empty($errors) && is_array($errors)) {
echo '<div class="alert alert-error"><h4>Error!</h4>The following error(s) occurred:<ul>';
foreach ($errors as $e) {
echo "<li>$e</li>";
}
echo '</ul></div>';
}?>
<div id="payment-errors"></div>
<span class="help-block">You can pay using: Mastercard, Visa, American Express, JCB, Discover, and Diners Club.</span>
<div class="alert alert-info"><h4>JavaScript Required!</h4>For security purposes, JavaScript is required in order to complete an order.</div>
<label>Card Number</label>
<input type="text" size="20" autocomplete="off" class="card-number input-medium">
<span class="help-block">Enter the number without spaces or hyphens.</span>
<label>CVC</label>
<input type="text" size="4" autocomplete="off" class="card-cvc input-mini">
<label>Expiration (MM/YYYY)</label>
<input type="text" size="2" class="card-expiry-month input-mini">
<span> / </span>
<input type="text" size="4" class="card-expiry-year input-mini">
<button type="submit" class="btn" id="submitBtn">Submit Payment</button>
</form>
<script src="buy.js"></script>

Answer 1

Thx Guys
I emailed STRIPE and based on feedback, the issue was that I should have been using SESSIONS....
PHP Manual Page on Session Handling