# What are the available pipelines **** **** **** | Class | Description | Payload | | --------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------ | -------------------------------------- | | CartItemBuilder | The process that occurs when adding an item to the cart. Extending this class allows for manipulation of the cart item before it is saved to the cart. | Aero\Cart\CartItem $item | | ContentForHead | The HTML content that will be inserted into the tag of the page. | String $content | | ContentForBody | The HTML content that will be inserted just before the closing tag of the page. | String $content | | RobotsTxt | The robots.txt file. For more information, click here. | Illuminate\Support\Collection $content |