Rails - May 2014 - Modelling multiple types of users with Devise and Rails 4

I have 3 types of "users"

Shop
Provider
Customer


The last 2 users will have similar attributes such as

First Name
Last Name
 and so on


And the Shop user type will have the most contrast between types.

As far as behaviours they will all be quite different, 
although Provider and Shop will inherent many of customer behaviours.

It seems the behaviours can be dealt with CanCan as I've researched.

I'm now attempting to  how I should authenticate these types.

I have looked at the STI model but I couldn't grasp where I would these 
extra attributes.

My mental model is as follower:

User is a table and model
The types are abstract models that inherit from this.

So I'm wondering, how do I add attributes such as Business address for just 
the Shop type?

Or is it that the User Table has a column called Type and that type is 
associated with these type tables? And within the type tables are the extra 
attributes?

 

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