At Ticketstoday, we use a third party to process our transactions. We know what you're thinking - that's a bit strange? Well, there's a very good reason for this. As a business, we don't want to compete with large corporations that offer tickets at super low prices, we'd rather partner with those businesses - by doing so we can offer better tickets at better prices.
So, going to a different URL when purchasing is perfectly normal. Nothing to be scared or worried about.