What are all the controller commands and task commands that get invoked starting from the AddToCart -> ShoppingCart -> CheckoutSignIn -> ShippingInfo -> ShippingMethod -> PaymentMethod -> Order Summary (basically navigating from the Shopping Cart page to the Order Summary page)? This may be a big question...Are there any links that may provide such an answer?
A brief answer here is as follows
(1) to be able to add an item to an cart - OderItemAdd
(2) to be able to update an item in a cart - OrderItemUpdate
(3) to delete an item in a cart - OrderItemDelete
(4) to associate a shipping address to an order - OrderItemUpdate
(5) to associate a billing address to an order - OrderItemUpdate
(6) to lock an order in commerce - OrderPrepare
(7) to submit an order for processing - OrderProcess