At the moment it is possible to get all the products with an API call, i tried going into the uwebshop files, and inside the StoreApiController i created inside PublicApiController i created this

public IEnumerable<Category> GetAllCategories()
        {
            return DomainHelper.GetAllCategories().Cast<Category>();

        }

But it gives me some problems when i try to access it.

Type 'uWebshop.Domain.Product' with data contract name 'Product:' is not expected. Consider using a DataContractResolver or add any types not known statically to the list of known types - for example, by using the KnownTypeAttribute attribute or by adding them to the list of known types passed to DataContractSerializer.

Any help would be great!