Paid Memberships Pro – Akismet

This add-on for Paid Memberships Pro runs your checkout through Akismet. It checks the submitted email address against Akismet's spam filters. If a checkout is flagged, membership registration is blocked.

It protects free registrations as well as paid checkouts. Payments are not processed for flagged email addresses, which helps against card testing, credit card fraud, fake registrations and spam.

It uses the settings in your Akismet plugin, so it needs no settings of its own. If you turned on the Akismet privacy notice for comment forms, the notice shows on the checkout page too.