Cart URLs allow you to share a URL that when visited, will automatically add a specific item to the users's cart and direct them to the start of the checkout process. Cart URLs are great for sharing on social networks, blog posts, or even email newsletters!
How It Works
An example Cart URL looks like this:
The most important part to pay attention to are the parts after the
product[id] contains the unique ID of the product you want to link to, and
product[quantity] contains the number of items that should be loaded into the cart.