By default, deleting PayPress does not remove your payment data. This helps prevent accidental data loss if you temporarily deactivate or reinstall the plugin.
To completely remove all PayPress data, go to PayPress → Settings, scroll to the bottom of the page, enable Delete plugin data on uninstall, and click Save Settings.
Once this option is enabled, you can deactivate and delete the PayPress plugin as you normally would. During the uninstall process, PayPress will permanently remove all of its database tables, settings, orders, subscriptions, logs, and other plugin data from your WordPress site.