What's the difference between installing KanBo from Microsoft app store in O365 versus the full installation on premises?

We want to understand the difference between installing KanBo from Microsoft app store in O365 versus the installation process based on installing KanBo on premise and then following steps for integration with SharePoint. Would just adding the app from the store suffice or alleviate some of the manual integration tasks that we have to perform?

The KanBo App in the Office Store is a free teaser version with limited functionality and allows only 5 users.

Regarding the clear text of client secret and client id this is up to you and your infrastructure if you want to encrypt the config or not. Here is how: https://msdn.microsoft.com/en-us/library/dtkwfdky.aspx. We are just following the Microsoft standards. You can also generate your own client ID and client secret and encrypt it additionally inside of the config. It is all up to you.