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