Hello, I need to inquire about the sales of products on various Amazon European sites. We adopt a self delivery method to complete the delivery of orders. We are not from European countries. I would like to inquire if we need to apply for a VAT. I would like to ask for your opinion on the issue of VAT, such as under what circumstances the fee needs to be paid, what we need to pay attention to when paying the fee, the consequences of forgetting or not paying the fee, and what are the recommended payment platforms and methods? Thank you.