Magento2 Checkout – How to Get Abandoned Cart Items Using API

I'll answer the question in two parts:

I. Where should you change the checkout URL?

The destination in link.phtml is $block->getCheckoutUrl(). You should not change the template to change functionality, but change the block Magento\Checkout\Block\Onepage\Link instead. To do so create a plugin for it with a method afterGetCheckoutUrl() to change the return value.

II. How to get all items in the cart?

As of magento-2.0 the service contracts in Magento_Checkout and Magento_Quote do not provide the necessary methods yet, so we use the cart model. In your plugin inject it like this:

public function __construct(\Magento\Checkout\Model\Cart $cart)
{
    $this->cart = $cart;
}

Now that you have access to the cart, you can retrieve the items in several ways, which is basically the same as in Magento 1:

• $this->cart->getQuote()->getItemsCollection()
  

  Returns a quote item collection with all items associated to the current quote.

• $this->cart->getItems()
  

  This is a shortcut for the method above, but if there is no quote it returns an empty array, so you cannot rely on getting a collection instance.

• $this->cart->getQuote()->getAllItems()
  

  Loads the item collection, then returns an array of all items which are not marked as deleted (i.e. have been removed in the current request).

• $this->cart->getQuote()->getAllVisibleItems()
  

  Loads the item collection, then returns an array of all items which are not marked as deleted AND do not have a parent (i.e. you get items for bundled and configurable products but not their associated children). Each array item corresponds to a displayed row in the cart page.

Choose what fits your needs best. In most cases the last method is what you need.

Add item to guest cart

[POST] http://.../Magento2/index.php/rest/V1/guest-carts/ - gives cart Id.

[POST] http://.../Magento2/index.php/rest/V1/guest-carts/a03da1c69a5b1b57a405d05a31e16ce5/items – Adds an item to cart.

Body - { "cartItem": { "quote_id": "a03da1c69a5b1b57a405d05a31e16ce5", "sku": "Mobile1", "qty": 10 } }