PayPal Express Checkout REST API return variables on onAuthorize

[mmbella]

Hello,

I am using PayPal Express Checkout REST API javascript and Django 2.0.x/Python views for an ecommerce site. I have been able to implement Express Checkout and have the customer redirected to a success page on my server through the onAuthorize function. I need to access the paypal old IPN style listener variables ... custom, mc_fee, email, first_name, last_name from paypal. I have no idea how to do this with the new REST API. 

Is this processed through a webhook and if so how? Example code?

I just need the above variables returned back to my server. 

Thanks

mmbella