The "Cart Links" settings will only appear when you have the Cart Links module enabled.
"Cart Links" settings are found at Store » Configuration » Cart Links (admin/store/settings/cart-links).
Cart links in Ubercart are specially crafted links that allow you to do the following things when a customer clicks them:
- Empty the customer's shopping cart.
- Add any quantity for any number of products (while setting attribute if applicable).
- Display a custom message to the user.
- Track the click for display on a store report.
- Redirect to any page on the site.
The settings page shows some instructions for creating links while taking care of a few administrative options:
- Display the cart link product action when you add a product to your cart - lets administrators with access see the product string necessary for the cart link to add a given product to the cart. All you have to do is go to the product page and add it like normal and a message will be displayed with the string to use.
- Track clicks through Cart Links that specify tracking IDs This checkbox turns on tracking for any cart link that has an ID.
- Allow Cart Links to empty customer carts This checkbox lets the API know it should process cart links that include the empty cart action.
- Cart Links messages This text area allows you to specify the custom messages used in cart links. These include an ID number and a text message separated by a | (pipe) character. Hit enter between separate messages.
- Cart Links restrictions This text area lets you restrict access to cart links to only the links specified in the box. Do not include the /cart/add/ part of the cart link when specifying links.
- Invalid link redirect page This final text field lets you specify what page to redirect to when you are restricting cart link access and someone attempts to use an inappropriate link.
Using the cart links module will allow you to track affiliate sales, see basic reports, and make sure malicious users or people don't create unapproved links. Cart links can be added wherever you want-on any node, post, or e-mail message for example.