Payload
also request body
The actual data carried inside an HTTP request or webhook, usually a JSON body containing the event's details.
Analogy
Like the contents of a package, separate from the shipping label and box.
Why it matters
Reading and mapping fields from the payload is how you route the right data into the next step of any automation.
In practice
A webhook payload like {"event":"form_submit","email":"a@b.com"} that your workflow parses.