| Hook | Description |
| hook_add_to_cart | Allows modules to perform an action when an item is being added to the cart and stop the action from occurring if need be. |
| hook_add_to_cart_data | Allows modules to copy extra data for a product when it is added to the cart. |
| hook_cart_item | Act on items added to a customer's shopping cart. |
| hook_cart_pane | Add information to the cart view screen. |
| hook_checkout_pane | Define panes used in the checkout process. |
| hook_download_authorize | Define additional checks before allowing a customer to download a file. |
| hook_file_action | Create new actions to operate on files found in the file downloads directory. |
| hook_file_transfer_alter | Alter a file before a customer downloads it. |
| hook_line_item | Define order line items displayed on cart and order screens. |
| hook_order | Execute code when Übercart loads, saves, or acts on an order. |
| hook_order_pane | Define panes used on the order screens to display and edit orders. |
| hook_payment_gateway | Define payment gateways used to process payments. |
| hook_payment_method | Define methods customers can use to pay for orders. |
| hook_shipping_method | Define methods to receive shipping quotes and fulfill orders. |
| hook_shipping_type | Define product shipping types so they may be shipped. |
| hook_store_status | Add items to the store status table on the main store administration screen. |
| hook_uc_message | Provide default messages for long configurable messages in your module. |
The following hooks are defined by Ubercart modules and should be used when extending the system's functionality. Links lead to pages with description and examples:
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