What external_id does the Facebook sales channel app use?

Shopify Expert
1 0 0

Hi, We have the Facebook pixel ID set in preferences and firing data. We cannot use the Facebook sales channel app to setup the pixel or Conversions API because the ad account is owned by another business manager so stopped us in our tracks.

So we are setting up conversions api manually. Everything else looks ok but we cannot find anywhere what external_id is being used by shopify and sent to Facebook so we can match up with the server.

Anyone know?

Thanks in advance