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A Sales Channel can be one of many things such as a re-sellers system, an app, a ticketing vending machine or similar. This funcion function is usually the travellers interface through which they buy their journey. In some cases these can also store or deliver a ticket distributed by the Local Back End Ticketing System. A Sales Channel is generally linked to a payment service provider that handles the payments. The Sales Channel can be from the same company as the ticket provider but it can also be a totaly separate company.
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