How do receipts and invoices differ on Catawiki?

How do I know if I, as a Seller, have to pay VAT on the sale of my object?

Why do I, as a Seller, no longer have to indicate whether my object is used or new?

As a Seller, will I receive a receipt for each object I sell?

Is it possible to receive an invoice without VAT for the Catawiki seller success fee?

How do I download my purchase receipt or seller success fee invoice?