WebHook:

• Send data to server async
• Expect it to send back later once processed
• Then return it back to said server

SSE:

• Creation Connection from Client -> Server
• Server can send back events (JSON payloads)
• Then close after sending all

Summary

• To send back data from Client -> Server -> Async Server, then back to Async Server -> Server -> client, Webhook + SSE Works well
• Also really good for [data streaming] (send pagination payloads)