I'm in charge of providing a poc for the following feature: add a button to the outlook web ui when creating an appointment to refer to a page for a catering service. When users would click on that button they'll be taken to a page where they can order sandwiches and the like. I should provide a bit of information to the page such as begin and end date time for the appointment in the link.
I've looked around and I've found this link that explains how to add a button to the Exchange/Outlook web ui, but I have no idea how to add functionality to that button. Or where I should put the code so Exchange takes it into account. Can you smart people help me on my way? Any article that describes how to add a button to the Outlook web ui and add functionality to that button is welcome.