Digioh's on-site widgets and lightboxes encourage customers to subscribe. You can send email addresses captured by Digioh directly into Klaviyo via a Digioh-Klaviyo integration.
While Klaviyo does not have a built-in integration with Digioh, you can still integrate your Digioh account with Klaviyo. This is possible via an integration available through Digioh.
You can view instructions on integrating Digioh with Klaviyo on the Digioh website.