Hi, I'm aiming to integrate WorldPay with a Zen Cart based store (version 1.3.9h, and sales to the UK only). Having read through the last year or more of this thread it's clear to me that a lot of problems are solved by using SSL. My hosting provider offers a shared certificate for free, or a paid one (Comodo InstantSSL Certificate) for £49 a year plus £2 a month for the IP address. Any views please on which I should choose?