Order receipts contain an editable area that can be used to add your data such as VAT number, company name, and more. Find the order in your Purchases and press on “Receipt” to get an invoice. Here you can add information either to the “Buyer” section or as a comment below the “Total”:
You can change the input details in the same manner if needed. After you complete your edits, press “Download” to get the receipt in .pdf format.