Once you have received the pixel from the agency, add it to the 'header' section under office information on the backend of WP for that site. 

If the agent would like to track leads through the meta pixel - you can send them the how to below; 

Should you wish to track leads, then best thing to do would be to use the event creator in business manager settings.


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If you go to data sets, and then go to the pixel you have created.
Then click open in events manager.

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Add Events, and then add custom conversion:

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Fill in the info, and the URL Contains keywords would be:

property-estimate/confirmation/

and 
agent-appraisal/confirmation/