App for telephone or video chat service as product?

New Member
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Does anyone know of an App that can be used in a product to offer a telephone or video chat consult? 

For example...the business sells remote consulting services; a phone or video chat consult for up to one hour for $23.  

I know I can create a service product and once a customer purchases the service, I can send an link in an email or chat App to set up the call. 

I'm wondering if there's a call App I can embed in the product description. 

It's a new store still in development so there's no link I can show.