The Tesco Clubcard app allows you to store your Clubcard on your phone in the form of a scannable barcode. This can be used in place of your Clubcard at the Checkout in Tesco Extra stores in Czech and Slovak republic. (So, no more leaving your Clubcard at home!)
If you have a Tesco Clubcard starting with 63400950 or 63400956, you can enter your details into this application to create your barcode. This barcode can then be scanned by asking a member of staff at the Tesco checkout.