Why did the first webhook lack heart rate?

When two webhooks arrive close together for the same session, the earlier one may lack a field like heart rate because the source data was still being updated.

When two webhooks arrive close together for the same session, the earlier one may lack a field like heart rate because the source data was still being updated. A later sync overwrites it once the source app adds the missing data.

Always use the most recent payload for a given session to get the complete record.