You can download your tax invoices under the Statements page of the Seller Lab, in the Customers section under the Invoices tab. These invoices will clearly reflect the 5% VAT that you charged on each order, and you can use them to pay the VAT to the UAE government.
Under the Invoices tab, you can also download the VAT noon Fees invoices which include a clear breakdown of the fees & commissions that are deducted by noon.com from each order. These invoices are also used to pay the VAT to the UAE government on the noon fees & commissions.
You can also download from the Reports page the Monthly VAT Pack, where you'll find the tax invoices of the entire month grouped together in one Zip file to help you with the VAT payments.