Create a line item

{
  "data": {
    "attributes": {
      "sku_code": "TSHIRTMM000000FFFFFFXLXX",
      "bundle_code": "BUNDLEMM000000FFFFFFXLXX",
      "quantity": 4,
      "_external_price": true,
      "_update_quantity": true,
      "_reserve_stock": true,
      "_reset_restocked_quantity": true,
      "unit_amount_cents": 10000,
      "compare_at_amount_cents": 13000,
      "name": "Men's Black T-shirt with White Logo (XL)",
      "image_url": "https://img.yourdomain.com/skus/xYZkjABcde.png",
      "item_type": "skus",
      "frequency": "monthly",
      "reference": "ANY-EXTERNAL-REFEFERNCE",
      "reference_origin": "ANY-EXTERNAL-REFEFERNCE-ORIGIN",
      "metadata": {
        "foo": "bar"
      }
    },
    "relationships": {
      "order": {
        "data": {
          "id": "XAyRWNUzyN"
        }
      },
      "item": {
        "data": {
          "id": "XAyRWNUzyN",
          "attributes": {
            "code": "TSHIRTMM000000FFFFFFXLXX",
            "name": "Men's Black T-shirt with White Logo (XL)",
            "description": "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.",
            "image_url": "https://img.yourdomain.com/skus/xYZkjABcde.png",
            "pieces_per_pack": 6,
            "weight": 300,
            "unit_of_weight": "gr",
            "hs_tariff_number": "4901.91.0020",
            "inventory": {
              "available": true,
              "quantity": 10,
              "levels": [
                {
                  "quantity": 4,
                  "delivery_lead_times": [
                    {
                      "shipping_method": {
                        "name": "Standard Shipping",
                        "reference": null,
                        "price_amount_cents": 700,
                        "free_over_amount_cents": 9900,
                        "formatted_price_amount": "€7,00",
                        "formatted_free_over_amount": "€99,00"
                      },
                      "min": {
                        "hours": 72,
                        "days": 3
                      },
                      "max": {
                        "hours": 120,
                        "days": 5
                      }
                    },
                    {
                      "shipping_method": {
                        "name": "Express Delivery",
                        "reference": null,
                        "price_amount_cents": 1200,
                        "free_over_amount_cents": null,
                        "formatted_price_amount": "€12,00",
                        "formatted_free_over_amount": null
                      },
                      "min": {
                        "hours": 48,
                        "days": 2
                      },
                      "max": {
                        "hours": 72,
                        "days": 3
                      }
                    }
                  ]
                },
                {
                  "quantity": 6,
                  "delivery_lead_times": [
                    {
                      "shipping_method": {
                        "name": "Standard Shipping",
                        "reference": null,
                        "price_amount_cents": 700,
                        "free_over_amount_cents": 9900,
                        "formatted_price_amount": "€7,00",
                        "formatted_free_over_amount": "€99,00"
                      },
                      "min": {
                        "hours": 96,
                        "days": 4
                      },
                      "max": {
                        "hours": 144,
                        "days": 6
                      }
                    },
                    {
                      "shipping_method": {
                        "name": "Express Delivery",
                        "reference": null,
                        "price_amount_cents": 1200,
                        "free_over_amount_cents": null,
                        "formatted_price_amount": "€12,00",
                        "formatted_free_over_amount": null
                      },
                      "min": {
                        "hours": 72,
                        "days": 3
                      },
                      "max": {
                        "hours": 96,
                        "days": 4
                      }
                    }
                  ]
                }
              ]
            },
            "created_at": "2018-01-01T12:00:00.000Z",
            "updated_at": "2018-01-01T12:00:00.000Z",
            "reference": "ANY-EXTERNAL-REFEFERNCE",
            "reference_origin": "ANY-EXTERNAL-REFEFERNCE-ORIGIN",
            "jwt_custom_claim": {},
            "metadata": {
              "foo": "bar"
            }
          },
          "relationships": {
            "shipping_category": {
              "data": {
                "id": "XAyRWNUzyN"
              }
            },
            "prices": {
              "data": {
                "id": "XAyRWNUzyN"
              }
            },
            "stock_items": {
              "data": {
                "id": "XAyRWNUzyN"
              }
            },
            "stock_reservations": {
              "data": {
                "id": "XAyRWNUzyN"
              }
            },
            "delivery_lead_times": {
              "data": {
                "id": "XAyRWNUzyN"
              }
            },
            "sku_options": {
              "data": {
                "id": "XAyRWNUzyN"
              }
            },
            "sku_list_items": {
              "data": {
                "id": "XAyRWNUzyN"
              }
            },
            "sku_lists": {
              "data": {
                "id": "XAyRWNUzyN"
              }
            },
            "attachments": {
              "data": {
                "id": "XAyRWNUzyN"
              }
            },
            "links": {
              "data": {
                "id": "XAyRWNUzyN"
              }
            },
            "events": {
              "data": {
                "id": "XAyRWNUzyN"
              }
            },
            "tags": {
              "data": {
                "id": "XAyRWNUzyN"
              }
            },
            "jwt_customer": {
              "data": {
                "id": "XAyRWNUzyN"
              }
            },
            "jwt_markets": {
              "data": {
                "id": "XAyRWNUzyN"
              }
            },
            "jwt_stock_locations": {
              "data": {
                "id": "XAyRWNUzyN"
              }
            },
            "event_stores": {
              "data": {
                "id": "XAyRWNUzyN"
              }
            }
          }
        }
      },
      "tags": {
        "data": {
          "id": "XAyRWNUzyN"
        }
      }
    }
  }
}