1) A general description of an e-commerce architecture as it pertains to the cloud. For example the payment gateway site can be onpremise but everything else can be hosted.
2) A vizio diagram or some equivalent that shows how ebay's portal is structured (this diagram should include the paymentgateway which is tied to the front end page which is tied to the application itself which is then tied to the back end [database])
3) A description of a portal/ how it is used or configured and benefits.
4) A screenshot of a portal
.A simple description of what each is layer is responsible in regards to #3.
.A screenshot and information of how PaaS systems are cheaper than on Premise systems