[The Hub Client] [Client Hub & Client billing] Allow customer to set up their own configuration



I have been waiting for the Hub client and was happy to test it.
This is a great step forward but I think we need some crucial features to use it as an agency.

Right now we have to set everything up in the Hub, then create the client and give him the access.
But it is very important for the client to be able to make his configuration himself.

It could be done just by having a link to a product created in the Hub.
This way the client can choose the product(s), his options and when he clicks on the link he can subscribe with his credit card, or add the subscription to his account if he already has one.

Hope this was clear enough !

Thanks for your work guys.