Proposed delivery options

This question was raised by DFC, who is investigating using VF.

We didn't find a way to represent the shipping options with different price and also, the free shipping possibility over a certain quantity.

Also, there are also different ways of paiements proposed by the providers that have to be described for each order/sell (cash, credit card, etc.).

A provider has to propose the different ways of shipping/paiements at first and an agreement as to be a representation of the sell itself, the shipping option chose and the paiement option chose.

DFC current model:

Note: http://www.heppnetz.de/ontologies/goodrelations/goodrelations-UML.png (I think this was also added to schema.org) has some delivery-specific stuff in their model.