If you use other plugins on your WordPress site besides the Digistore24 WordPress plugin, the Digistore24 WordPress plugin may not work as expected.Link CloakingWhen using upsells, the "Link Cloaking" plugin causes the [digistore_yes_url] and [digistore_no_url] placeholders to not be filled correctly which prevents upsells from working.To fix the issue, proceed as follows:Click on Settings in the WordPress admin area.Click on Link Cloaking.Copy the following line and paste it into the Exceptions field. Be careful not to omit any character:www.digistore24.com[digistore_yes_url][digistore_no_url]Save the changes.Test your upsell flow.Better WP SecurityThe Better WP Security plugin can affect the forwarding to a thank you page. Disable the Prevent long URL strings setting in the plugin. This setting cuts off parts of the thank you page URL which causes the digital signature verification to fail.