No, the Real Happy app is only for you and your team members. There is nothing to download for buyer agents and your clients who book and manage showings through a personlized web link.
Yes, you can set the properties to either be approved by your client, by you or no approval needed at all.
Yes, Real happy generates a unique link per property as well as a property list that contains all of your properties in a single link.
We are currently in discussions with a number of software partners regarding API integrations.
We are currently developing a web dashboard that will give you access to the Real happy app features via a desktop interface.