To revoke and remove LeadSync’s access to your Facebook profile and page, follow these steps:

  1. Login to Facebook and select Settings from the top left drop down


    2. Click on Business Integrations

    3. Find and select the LeadSync app

    4.  Click Remove.

Facebook has further details on removing Apps and CRM's here:
https://business.facebook.com/business/help/1588743581429919?id=735435806665862

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