Approval action: 'S' | 'P' | 'A' | 'R' | 'U'
[Read-only] Created timestamp
[Read-only] When the action occurred
OptionalenvelopeidEnvelope ID (if for an expense report)
[Read-only] Unique ID
OptionalnotesNotes or reasons
OptionalprojectidProject ID (if project-based)
OptionaltimesheetidTimesheet ID (if for a timesheet)
OptionaluseridUser ID who performed the action
An approval history event for envelopes or timesheets. Read-only (supports equal-to reads only). :contentReference[oaicite:3]{index=3}:contentReference[oaicite:4]{index=4}