application & filing of German VAT

Dear Team, We are a Non- EU entity & looking to apply for german VAT in order to sell our products on the Zalando marketplace via ZFS services. In this case the consignee will be Zalando and as per Zalando they will be depositing the VAT for sales made for our product through their platform. Hence, we wanted to understand the following: - Process to apply for German VAT & Charges for the same. - Since Zalando is depositing the VAT for sales of our products, what will the filing process from our end on monthly basis - Will we get VAT refund on the import VAT paid at the time or export to Germany . If yes what will be the process..or will this be adjusted against vat revieved from customers by zalando on each sale made on the platform. We also understand that we may not have to pay import vat upfront and only partial and rest to be adjusted with customer payments