Retrieve leads from multiple pages Facebook API

Multi tool use


Retrieve leads from multiple pages Facebook API
I'm currently working in a project where i want to, after requiring permissions, automatically retrieve leads originated from my clients' facebook page.
For this, i'm using the facebook Graph API v3.0 in my PHP backend. I had success retrieving my client's form data but now i'm struggling to automatically retrieve their leads.
I was primarily trying to create a webhook for each page, aiming to my API. The problem is: i didn't found any permission to ask to do this, the only way that i found was specifying the client's app id and secret, which i'm not wanting to do.
Does anyone know some way to create those webhooks with other method or i will need to ask for leads_retrieval permission and keep requiring those leads periodically?
Thank you for the help.
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