Meaning
The actual meaningful data transmitted in an HTTP request or message, excluding protocol headers and metadata.
Three examples from work
API troubleshooting
DevThe server returned HTTP 413 Payload Too Large.
LeadThe client is sending raw uncompressed base64 images; instruct them to use direct S3 presigned URLs.
Integration contract
Frontend DevCan we strip unnecessary user metadata from the authentication payload?
Backend DevYes, keeping the JWT payload small improves network performance on mobile devices.
Webhook design
ArchitectWhat information should we include in the order created webhook payload?
POSend the order ID, status, and total amount; let consumers query full items on demand.
Collocations: 'request payload', 'response payload', 'payload validation'. Distinguish the payload from transport headers.