I've been asked to build an ecommerce site based on a theme which runs on woo commerce. That's the easy bit and I'm reasonably happy with the project apart from payment gateways... The last e-com site I built took paypal payments and that was fine but the client on this one is wanting to take credit / debit card payments too and tbh, I'm lost with it all!! I can buy an SSL certificate with the hosting company (vidahost) which seems to be the bare minimum for the paid for plugins such as paypal pro but the likes of sagepay have much greater security requirements which I'm really not sure how to go about achieving (ie; PCI DSS certification)? Firstly what is PCI DSS? and secondly, do I need to worry about it or am I much better off just sticking to the likes of PayPal Pro?