About offline event data deduplication

When you upload offline event data, a de-duplication process detects and skips duplicates of events that you already uploaded and matched in the last seven days. This helps ensure that your offline event and attribution reporting is as accurate as possible.

De-duplication occurs when:

• You upload offline event data on a daily basis, but at different times, so there's some overlap with the previous day's upload.
• You have partially completed uploads across multiple attempted uploads.

For example, if you accidentally upload the same offline event twice, deduplication will only detect the first transaction and skip the second one. If you don't want transactions deduplicated, such as if the same person makes multiple purchases at different times, make sure to include a precise timestamp, with hours, minutes and seconds. Also include a unique Order ID and item number for each transaction so that we know that the events aren't duplicates.

Note: The deduplication process compares new event data with previously uploaded event data in order to detect and upload new events only. The process is not intended to edit or update previously uploaded event data.