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We have a Drupal Commerce installation with some standard modules installed e.g. Commerce Shipping and Rules. Both are used to calculate the shipping cost. However we would like to calculate the shipping based on the points below:
- category: each category has it's own shipping costs. Inside a category all the products have the same shipping rate
- when there are multiple products in the shopping cart, only the highest shipping rate should be calculated only once for the complete shopping cart. E.g. there are three products in the cart. One product has a shipping cost of USD 10,-, one product of USD 15,- and one of USD 20,-. In this case the shipping costs for this customer would be USD 20,-.
Ideally the calculation of the shipping costs is done with the standard modules (Commerce Shipping and Rules) so we can easily update the rates and categories ourself.