There are Pablo terminals at the port of Calais! (Port of Calais, T62225 Calais Cedex) which will allow you to scan your barcode / tax free form
We advise that you arrive at least 1 or 2 hours in advance in order to have time to complete all the formalities and scan your barcode!
When you arrive at the Ferry Terminal, prepare your tax-free form and all the items you want to get the refund on (They must be in brand new condition) in case of inspection by the customs.