A simple module that allows you to add a product to a cart via a URL. This is adventageous for email marketing laniding pages. Written for Drupal 7 Commerce.
Once installed a product can be added to a cart by constuction the following URL: http(s)://your.site.url/product/add//
Assume your site is spacecogs.com, the SKU of your product is 10011 and the quantity is 15 (on an SSL site). Your URL would be: https://spacecogs.com/product/add/10011/15