website, Customers will indicate their acceptance of these terms and conditions and the Carrier's terms of carriage by ticking the designated boxes. At the end of the order process, Customers will be given a summary. They can then confirm their order by clicking on the corresponding box and proceed with on-line payment. When their order is complete, they will receive an e-mail confirming their order. Customers will be responsible for printing their voucher before leaving, using their own means, on blank white A4 paper (21.0 cm x 29.7 cm), without changing the font size, in portrait orientation (vertical). Voucherscannot be presented on any other medium (electronic screen). Good quality printing is necessary. Partially printed, soiled, damaged or illegible tickets will not be accepted on board and will be considered invalid. If there is a problem or poor quality printing, Customers must reprint their tickets. 4.4. If tickets are ordered by telephone via the Call Centre, the operator will give Customers a verbal summary of the order which they have to accept for the order to be effectively registered. They will also be given an order number. The ticket(s) will be sent by standard post to Customers at the delivery address indicated when ordering, once Altibus has received payment from them. If Customers do not receive the tickets ordered, they are advised to contact the Call Centre within a sufficient period of time before their departure. Article 5. FINANCIAL TERMS AND CONDITIONS 5.1. The prices charged by the Carriers as indicated