If your store needs to change the contents, price, or delivery conditions of an order that has been made on Yandex.Market, follow these rules:
The actions of the store manager and customer in this case are described below.
If the customer asks the manager to add extra items to the order when clarifying order details, the store manager can add these items to the order on the store side, but the Yandex.Market interface will continue showing the original order.
If the customer wants to add items on his own, he can:
If items need to be removed from the order or replaced with different items when the order details are being confirmed, the store manager can:
If the customer wants to remove or replace items on his own, he will need to cancel the current order in his account and create a new one.
A store should never change the cost of an order under any circumstances.
The store may change the delivery date, address, and delivery method at any point when fulfilling an order. The store can only change the delivery cost if delivery conditions changed, and only if post-payment is selected as the payment type.