GraphQL checkout tutorial
Step 2. Create an empty cart
The createEmptyCart mutation creates an empty shopping cart and generates a cart ID.
For logged-in customers, send the customer’s authorization token in the Authorization parameter of the header. See “Get customer authorization token” for more information.
Request:
The following mutation creates an empty cart:
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mutation {
  createEmptyCart
}
Response:
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{
  "data": {
    "createEmptyCart": "A7jCcOmUjjCh7MxDIzu1SeqdqETqEa5h"
  }
}
In the subsequent tutorial steps, the unique shopping cart identifier A7jCcOmUjjCh7MxDIzu1SeqdqETqEa5h will be listed as { CART_ID }.
Verify this step
There are no additional verification steps. The values of quote and entity_id value are  not displayed on the website or in the Magento Admin.