We use Asana with our customers, however I am running into a data issue. Some fields are for internal users only. For example on code direction that a customer should not see even though they should see the other ‘public’ fields and all the comments. Same goes for hours spend on a task which is an internal issue for fixed price projects.
@Rogier_Willems If your customer have access to that project then yes they will be able to see those custom fields even as Guests. The one work around could be is adding making those Custom fields only available to for example the “Internal Charging” project, then any Tasks that needs those fields you add that task to the Project, and if you make sure your customer can’t see the Internal Charging project I believe they won’t be able to see the Custom Fields belonging to that project.
Hope that helps.