Use dynamic email address through Paypal checkout

I have a website that is a sort of online mall. I want every store in the mall to be able to get payment by paypal. I’m currently using the next extention for it:

From what I see in the documentation, I don’t see a place where I can define the email that is reciving the payment. The only thing I define is the client an secret id, which I’m getting from the paypal developer account.

Do you know how can I add dynamicly an email address so that the payment will go to the paypal account registered on that email?

Thank you!