INPUT_OBJECT

CheckoutLineItemInput

Specifies the input fields to create a line item on a checkout.

GraphQL Schema definition

input CheckoutLineItemInput {
#   The identifier of the product variant for the line item.
variantId: ID!
#   The quantity of the line item.
quantity: Int!
#   Extra information in the form of an array of Key-Value pairs about the line 
#   item.
customAttributes: [AttributeInput!]
}

Require by

CheckoutCreateInputSpecifies the fields required to create a checkout.
MutationThe schema’s entry-point for mutations. This acts as the public, top-level API from which all mutation queries must start.