Hi, I have a similar issue, however I want to display my customer's login email after registration. Is there a page where all these tags/ variables are shown correctly for Shopify?

I found that it can, however at every purchase you have to create an item on paypal and give the tax% which can vary with every purchase so it can be a solution however it needs patience and time 

Can't paypal business account do invoices including your business / or buyer's VAT Number?