If you are exporting goods to the European countries where the total value of your products are 150 Euros or less, and the VAT was paid at the point of sale. You need to specify your IOSS number when booking in shipments.
To add your IOSS number into your Shiptheory account so that we send it to your couriers on your behalf please see this link here which takes you directly to the page where you can add into Shiptheory your IOSS number
If you're unsure whether or not Shiptheory currently sends your IOSS number to your courier and need help with this, get in touch with our support team and we'd be happy to help you.