Abstract: A radius parameter may be included with mapping data requests resulting from “longpress” fingertip selection actions on client computing devices including touch screen display interfaces. The radius parameter may be based on the approximate size of a user's finger in pixels. Based on a current zoom level and/or altitude and a latitude, the radius may be used with a finger tip size to determine how far away a location on the screen from the finger tip center is. A remote mapping server may use the radius as a distance limit for performing a snapping action. For example, if the best candidate for a feature snap is outside the range of the longpress radius, then the feature snap may be abandoned, and the remote mapping server returns a dropped pin response to the client. The user may then customize the dropped pin for sharing or other actions.

Abstract: A customer interacts with merchants to identify items to purchase, and the merchants provide virtual shopping carts identifying the items to a broker. The cart requests that the broker utilize custom merchant calculations for the transaction, such as for determining shipping costs. The customer interacts with the broker to identify customer information, such as a shipping address, and to purchase the items. The broker sends the customer information to the merchant and requests that the merchant perform the custom calculations. If the merchant provides a valid response to the request, the broker uses the merchant calculations to calculate the total price for the transaction. If the merchant provides an invalid response, the broker utilizes backup calculations specified in the cart to calculate the price.

Abstract: An electronic commerce system includes a broker that enables customers to purchase items from multiple different merchants. A customer anonymously interacts with the merchants to identify items to purchase, and the merchants provide virtual shopping carts including the item and tax information to the broker. The tax information describes tax rates for the item in multiple jurisdictions. The broker determines the jurisdiction applicable to the customer by, for example, determining a shipping address for the customer. The broker uses the tax information and jurisdiction to calculate the taxes to collect for the item. The broker determines the total cost for the transaction, and conducts an electronic commerce transaction for the item with the customer.

Abstract: An electronic commerce system includes a broker that enables customers to purchase items from multiple different merchants. A customer anonymously interacts with the merchants to identify items to purchase, and the merchants provide virtual shopping carts including the item and tax information to the broker. The tax information describes tax rates for the item in multiple jurisdictions. The broker determines the jurisdiction applicable to the customer by, for example, determining a shipping address for the customer. The broker uses the tax information and jurisdiction to calculate the taxes to collect for the item. The broker determines the total cost for the transaction, and conducts an electronic commerce transaction for the item with the customer.

Abstract: A customer interacts with merchants to identify items to purchase, and the merchants provide virtual shopping carts identifying the items to a broker. The cart requests that the broker utilize custom merchant calculations for the transaction, such as for determining shipping costs. The customer interacts with the broker to identify customer information, such as a shipping address, and to purchase the items. The broker sends the customer information to the merchant and requests that the merchant perform the custom calculations. If the merchant provides a valid response to the request, the broker uses the merchant calculations to calculate the total price for the transaction. If the merchant provides an invalid response, the broker utilizes backup calculations specified in the cart to calculate the price.