> For the complete documentation index, see [llms.txt](https://docs.tryterra.co/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.tryterra.co/faq/help-topics/data-api-sdk/webhooks-dedup-and-sync-reliability/near-simultaneous-webhooks-use-latest.md).

# 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. 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.