What is the attribution window for conversions?

The default conversion attribution window (the number of days between someone viewing or clicking your ad and taking an action on your website)  is 1 day after an impression and 28 days after a click.

You can check and edit the attribution window from your account Settings page.

What happens if a user saw two ads from two separate campaigns? Facebook's last touch attribution model is used, so the conversion will be attributed to the most recently viewed/clicked ad (and its campaign).

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