Which feature allows you to leverage webhooks to send data out of Klaviyo?

Flows are the correct answer because they offer a "Webhook" action, allowing you to send custom HTTP requests to external systems when a specific event occurs within the flow. This is ideal for integrating Klaviyo with other applications or services that can receive data via webhooks. Campaigns are used for one-time or recurring mass email/SMS sends and do not inherently support sending data out via webhooks. Integrations refer to connecting Klaviyo with other platforms, but this typically involves pulling data into Klaviyo or using pre-built connectors, not custom webhook pushes from Klaviyo itself.