Event payloads & geometry fields
plannedThe field-level layout of the sessionStart payload (context, verificationParameters) and of the geometryChange payload (adView / viewport / obstructions), plus which fields are available under full versus limited access mode.
What this page will cover
- sessionStart payload field table
- geometryChange payload field table
- How access mode affects field availability
- The NativeViewKeys listing
Source material
| Source | File / path | commit | Fetched | Integration status |
|---|---|---|---|---|
| InteractiveAdvertisingBureau/Open-Measurement-JSClients | src/common/event-typedefs.js | b6f12bd | 2026-09-22 | not integratedThe client repo carries event typedefs, but payloads are built by the OM Service and the field-level definitions live in the spec PDF |
Gaps to verify
- The field-level layout must be verified against the official OMID spec PDFs: payloads are constructed by the OM Service, and the client repo's typedefs alone are not sufficient provenance.
Related chapters
- VerificationClient
- Access modes & geometryplanned
- Enumeration registry