If you're using one of the Flipdish template websites, then all you need to do is set up a Facebook business account and then create a Facebook pixel.
Once the above is completed, all you need to do is log into the Flipdish portal and navigate to Website -> Website settings and scroll down to the Facebook App ID section.
Place your Tracking ID into the field and hit save.
If you're using the Flipdish ordering system embedded in your Website, then you need to make sure you have also tracked the Website that the ordering is embedded in with the same Facebook pixel tag.
For more info setting up tracking from Facebook
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