Getting data into Mixpanel is the foundation of everything else. The Sending Data Into Mixpanel module — part of the Implement phase of Mixpanel Onboarding — covers how to evaluate and choose between ingestion methods (client-side SDKs, server-side SDKs, direct API, CDPs, and Warehouse Connectors), how to implement your chosen method, how to manage user identity, and how to backfill historical data if needed.