Help Multistore 9.2 and Add Ins

[verishare]

As a test I built a class using the order options contract with no luck other than getting it to show up in the add in manager. My goal is to build my own taxrate addin to do some custom fee calculation on products. Does someone have an example or documentation (other than erps manual)?

[verishare]

Using IInventory Contract with IShoppingCart GetInventories(IShoppingCart products, InventoryRequestTypeFlags requestType). How would one return a modified quantity back to the cart?

Thus far I have:

[AddIn("Inventory",
Version = "1.0.0.0",
Description = "Inventory",
Publisher = "me")]

public class CheckInventory : IInventory
{

public IShoppingCart GetInventories(IShoppingCart products, InventoryRequestTypeFlags requestType)
{

foreach (ICartItem ICitem in products.Items())
{
int itemQTY=ICitem.Quantity();

//code to modify this items quantity

}

//something modifed to return as a modified IShoppingCart
return products;
}

}