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System Requirements for WP Simple Pay

We generally follow the web host recommendations given by WordPress.org. As they do, here’s what we recommend for running WP Simple Pay:

  • PHP version 7.4 or greater
  • MySQL version 5.6 or greater or MariaDB version 10.1 or greater
  • HTTPS support

Need help choosing a web host? See our recommended WordPress hosting providers.

Stripe Account

WP Simple Pay requires a Stripe account. If you don’t have one yet, sign up for a free account at Stripe.com. See Stripe’s business information requirements.

SSL (HTTPS)

Stripe requires that any page hosting a live checkout form be SSL (they should start with https://).

Most of our recommended WordPress web hosts offer free SSL certificates, but you can also purchase one for as low as $10/year that meets all the necessary security standards.

If needed, also see WPBeginner’s guide to enabling SSL and HTTPS in WordPress.

For further security details, see Stripe’s integration security guide. Stripe recommends using the SSL Server Test by Qualys SSL Labs to make sure you have everything set up in a secure way.

Finally, if needed, you can use Test mode on non-SSL test and staging sites.

Excluding Confirmation Pages from Cache

Some web hosts implement aggressive caching to boost the overall performance of your sites. In these cases, you’ll need to contact your host and let them know to exclude your payment success and failure pages (URLs) from caching. For additional details, see Troubleshooting Caching Issues.

PHP and WordPress Version Support

At a bare minimum, the official Stripe PHP library included in WP Simple Pay requires PHP 5.6 even in legacy environments. PHP 7.4 or higher is still strongly recommended for security and performance reasons.

We highly recommend that you keep your WordPress version current to access the latest features and security patches, however WP Simple Pay can run on WordPress 5.2+.

To take advantage of the latest features in WP Simple Pay, please use the latest version of WordPress.

Increasing the WP Memory Limit

You may experience errors or performance issues if your WP Memory Limit is set too low. By default, WordPress sets this at 40 MB, though some hosts may change this for you automatically. We recommend setting it to 256 MB or higher (whatever your host allows).

To make this change, you’ll need to edit or add this constant to your wp-config.php file.

define( 'WP_MEMORY_LIMIT', '256M' );

If needed, see how to edit your wp-config.php file.

System Report

For your own troubleshooting and if you need to contact support, you’ll need to have your server and hosting specifications available. To view these go to Simple Pay → System Report in your WordPress admin.

Stripe API Version

In the Developers section of your Stripe dashboard, do you see an “Upgrade Available” button? Just like WordPress itself, we recommend you keep your Stripe API version reasonably current. Stripe does not update this automatically. You must update manually.

Stripe doesn’t introduce major API changes affecting WP Simple Pay very often, and it’s usually fine to just update it once in a while. But if the Stripe API version you’re using gets too outdated, unforeseen issues may arise.

WP Simple Pay is always tested against the latest Stripe API version within a week or less of a new Stripe API update. If a WP Simple Pay update is needed, we will roll it out as soon as possible.

PCI-DSS Compliance

Although Stripe is taking care of storing all credit card data, this data is still passing through your checkout pages, so they need to adhere to the PCI-DSS (Payment Card Industry Data Security Standard). This means Stripe requires all communication to meet the TLS 1.2 standard.

Yes, that’s a few too many acronyms, but luckily you can simply download and run the TLS 1.2 Compatibility Test plugin to verify your compliance.

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Updated on August 17, 2022