Provides a formula webform component for computed values, where you can enter a mathematical calculation based on the other fields. E.g., create a formula field with value formkey1 * 0.1 * formkey2.
Postal code (US ZIP codes, UK postcodes etc) filtering functionality for the Drupal Commerce checkout process. This module provides 2 main modes (whitelisting and blacklisting) which allow shop owners to restrict the areas of a country that they deliver to: