VAT tax and other taxes in two-sided marketplaces

Hi,

We are preparing a two-sided (ie. multi-vendor) marketplace.

Can anyone give a hint about the VAT tax and other taxes issue. We (the platform) are a company in the EU that is VAT-registered. Both our merchants and buyers will be companies or people from the EU (including VAT-registered and not VAT registered entities) and outside. So they could be:

EU VAT-registered company
EU non-VAT company
EU person
non-EU company
non-EU person

And each entity can be both merchant or...

VAT tax and other taxes in two-sided marketplaces

from VAT tax and other taxes in two-sided marketplaces