WPMUDEV plugin for Appoinments+ Service Provider Profile

Hey there,
I'm creating a custom page for Appointments+ Service Providers Profile where I would love to display the customer comments about the service.

I want to send a email to the customer, 24 hours after the service is done, asking about the service.
Is there any plugin or way to do it?

I could just add the 'wp-comments' system or something about badges, but I want just customers commenting after the service is done.

Any idea will be appreciated Really thanks!