For this, we would advise the client or the client’s web development team handle the integration using our convenient help documentation. Web apps are something that requires intimate knowledge of the structure and composition of the site. So, it’s best left to the creator or maintainer of said app to integrate new technologies onto it.

Here is the web integration best practices doc which links to things like adding links and information about the style sheet and API.

And Here is a link to the FareHarbor button generator where the client can experiment with the different styles of buttons and get an html output for the ones they like.

All of these are client-facing.