QB have sent me an email to link my PayPal Here account to QB for smart invoicing but no details on how to do it. Any ideas please?

Hello Atlasvehicletran, 

Welcome to the Community page, 

If you have a look at this link here it will show and tells you how to connect your paypal bank account up in Quickbooks so that all your transactions come through and you can then match them up with the data entered into your account.