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Last update 04/03/2024

Create Item with associate size chart

Important:
For all domains the size chart association format is the same

Associate size chart to an item

To associate a size chart to listings within the required domains, you will have to execute a POST on the items, sending the new attributes of type SIZE_GRID_ID, the size chart which we want to associate the item or variation and SIZE_GRID_ROW_ID with reference to the row in the size chart. The size_grid_id and size_grid_row_id fields are new attributes in the payload at item creation.


  • size_grid_id: is the ID of the size chart that was created.
  • size_grid_row: is the ID of the grid row.
  • The user that creates the item must be the same one that created the chart.
  • The chart gender must be corresponding to item gender.
  • It is not possible to associate a chart without row_id associated>.

In the creation of the footwear article, the attributes of the size guide number created in the previous steps must be included. It should be inserted in the attribute block, following the example below:


  • SIZE_GRID_ID:
  • id: the new field "SIZE_GRID_ID".
  • value_name: the ID (number) of the guide.
"attributes": [
    {
    "id" :"SIZE_GRID_ID",
    "value_name": "664737"
    },

We also need to associate the size guide rows with the variations of the article being created. In other words, each variation must be associated with a row from the size table. Therefore, the "SIZE_GRID_ROW_ID" field should be included in the variation attributes:


  • SIZE_GRID_ROW_ID:
  • id: the new field "SIZE_GRID_ROW_ID".
  • value_name: the ID (number) of the guide + ":" + the corresponding row number in the size table. For example apply to footwear:

"attributes": [
    {
    "id" :"SIZE_GRID_ROW_ID",
    "value_name": "664737:1"
    },
Important:
The item's SIZE must exist in the size_grid_id, meaning the SIZE value must exist in the SIZE_GRID_ROW_ID. The form associate size chart this same to footwear and tops & bottoms.

Request:

curl -X POST -H 'Authorization: Bearer $ACCESS_TOKEN' -H "Content-Type: application/json" https://api.mercadolibre.com/items -d
        

Response:

curl 'https://api.mercadolibre.com/items' -H 'Content-Type: application/json' -H 'Authorization: Bearer $ACCESS_TOKEN' -d '{
 
        {
         "site_id": "CBT",
          "title": "CREATE ITEM WITH - GDT SNEAKER MAN ",
          "category_id": "CBT3724",
          "official_store_id": null,
          "price": 12,
          "currency_id": "USD",
          "available_quantity": 7,
          "sale_terms": [
              {
                  "id": "WARRANTY_TYPE",
                  "name": "Warranty type",
                  "value_id": "6150835",
                  "value_name": "No warranty",
                  "value_struct": null,
                  "values": [
                      {
                          "id": "6150835",
                          "name": "No warranty",
                          "struct": null
                      }
                  ],
                  "value_type": "list"
              }
          ],
          "buying_mode": "buy_it_now",
          "listing_type_id": "gold_pro",
          "start_time": "2022-10-17T20:18:52.000Z",
          "condition": "new",
           "pictures": [
              {
                  "id": "644516-CBT51699767208_092022",
                  "url": "http://http2.mlstatic.com/D_644516-CBT51699767208_092022-O.jpg",
                  "secure_url": "https://http2.mlstatic.com/D_644516-CBT51699767208_092022-O.jpg",
                  "size": "500x247",
                  "max_size": "1205x597",
                  "quality": ""
              },
              {
                  "id": "862503-CBT51700450573_092022",
                  "url": "http://http2.mlstatic.com/D_862503-CBT51700450573_092022-O.jpg",
                  "secure_url": "https://http2.mlstatic.com/D_862503-CBT51700450573_092022-O.jpg",
                  "size": "500x247",
                  "max_size": "1214x600",
                  "quality": ""
              }
          ],
          "video_id": null,
          "accepts_mercadopago": true,
          "non_mercado_pago_payment_methods": [],
          "shipping": {
              "mode": "not_specified",
              "methods": [],
              "tags": [],
              "dimensions": null,
              "local_pick_up": false,
              "free_shipping": false,
              "logistic_type": "not_specified",
              "store_pick_up": false
          },
          "seller_address": {
              "address_line": "No.1003 shennandadao road, futian District",
              "zip_code": "518033",
              "city": {
                  "id": "Q04tR0RTaGVuemhlbg",
                  "name": "Shenzhen"
              },
              "state": {
                  "id": "CN-GD",
                  "name": "Guangdong"
              },
              "country": {
                  "id": "CN",
                  "name": "China"
              }
          },
          "location": {},
          "coverage_areas": [],
          "attributes": [
               {
                  "id" :"SIZE_GRID_ID",
                  "value_name": "664737"
              },
              {
                  "id": "AGE_GROUP",
                  "name": "Age",
                  "value_id": "6725189",
                  "value_name": "Adults",
                  "value_struct": null,
                  "values": [
                      {
                          "id": "6725189",
                          "name": "Adults",
                          "struct": null,
                          "source": 2579503448603610
                      }
                  ],
                  "attribute_group_id": "OTHERS",
                  "attribute_group_name": "Others",
                  "source": 2579503448603610,
                  "value_type": "list"
              },
              {
                  "id": "BRAND",
                  "name": "Brand",
                  "value_id": "10331273",
                  "value_name": "Generic",
                  "value_struct": null,
                  "values": [
                      {
                          "id": "10331273",
                          "name": "Generic",
                          "struct": null,
                          "source": 4954751883138633
                      }
                  ],
                  "attribute_group_id": "OTHERS",
                  "attribute_group_name": "Others",
                  "source": 4954751883138633,
                  "value_type": "string"
              },
              {
                  "id": "FOOTWEAR_TYPE",
                  "name": "Footwear type",
                  "value_id": "517583",
                  "value_name": "Sneaker",
                  "value_struct": null,
                  "values": [
                      {
                          "id": "517583",
                          "name": "Sneaker",
                          "struct": null,
                          "source": 4954751883138633
                      }
                  ],
                  "attribute_group_id": "OTHERS",
                  "attribute_group_name": "Others",
                  "source": 4954751883138633,
                  "value_type": "list"
              },
              {
                  "id": "GENDER",
                  "name": "Gender",
                  "value_id": "339666",
                  "value_name": "Man",
                  "value_struct": null,
                  "values": [
                      {
                          "id": "339666",
                          "name": "Man",
                          "struct": null,
                          "source": 4954751883138633
                      }
                  ],
                  "attribute_group_id": "OTHERS",
                  "attribute_group_name": "Others",
                  "source": 4954751883138633,
                  "value_type": "list"
              },
              {
                  "id": "ITEM_CONDITION",
                  "name": "Item condition",
                  "value_id": "2230284",
                  "value_name": "New",
                  "value_struct": null,
                  "values": [
                      {
                          "id": "2230284",
                          "name": "New",
                          "struct": null,
                          "source": 4954751883138633
                      }
                  ],
                  "attribute_group_id": "OTHERS",
                  "attribute_group_name": "Others",
                  "source": 4954751883138633,
                  "value_type": "list"
              },
              {
                  "id": "MODEL",
                  "name": "Model",
                  "value_id": null,
                  "value_name": "generic",
                  "value_struct": null,
                  "values": [
                      {
                          "id": null,
                          "name": "generic",
                          "struct": null,
                          "source": 4954751883138633
                      }
                  ],
                  "attribute_group_id": "OTHERS",
                  "attribute_group_name": "Others",
                  "source": 4954751883138633,
                  "value_type": "string"
              },
              {
                  "id": "STYLE",
                  "name": "Style",
                  "value_id": "6694773",
                  "value_name": "Urban",
                  "value_struct": null,
                  "values": [
                      {
                          "id": "6694773",
                          "name": "Urban",
                          "struct": null,
                          "source": 4954751883138633
                      }
                  ],
                  "attribute_group_id": "OTHERS",
                  "attribute_group_name": "Others",
                  "source": 4954751883138633,
                  "value_type": "list"
              }
          ],
          "variations": [
              {
                  "id": 175507138874,
                  "price": 12,
                  "attribute_combinations": [
                      {
                          "id": "COLOR",
                          "name": "Color",
                          "value_id": "2450295",
                          "value_name": "Black",
                          "value_struct": null,
                          "values": [
                              {
                                  "id": "2450295",
                                  "name": "Black",
                                  "struct": null,
                                  "source": 4954751883138633
                              }
                          ],
                          "source": 4954751883138633,
                          "value_type": "string"
                      },
                      {
                          "id": "SIZE",
                          "name": "Size",
                          "value_id": "469803",
                          "value_name": "5 US-M",
                          "value_struct": null,
                          "values": [
                              {
                                  "id": "",
                                  "name": "5 US-M",
                                  "struct": null,
                                  "source": 3376461333454861
                              }
                          ],
                          "source": 3376461333454861,
                          "value_type": "string"
                      }
                  ],
                  "available_quantity": 5,
                  "sale_terms": [],
                  "picture_ids": [
                      "644516-CBT51699767208_092022"
                  ],
                  "seller_custom_field": null,
                  "catalog_product_id": null,
                  "attributes": [
                      {
                          "id" :"SIZE_GRID_ROW_ID",
                          "value_name": "664737:1"
                      },
                      {
                          "id": "MAIN_COLOR",
                          "name": "Main color",
                          "value_id": "2450295",
                          "value_name": "Black",
                          "value_struct": null,
                          "values": [
                              {
                                  "id": "2450295",
                                  "name": "Black",
                                  "struct": null,
                                  "source": 4954751883138633
                              }
                          ],
                          "source": 4954751883138633,
                          "value_type": "list"
                      },
                      {
                          "id": "PACKAGE_HEIGHT",
                          "name": "Package height",
                          "value_id": null,
                          "value_name": "30 cm",
                          "value_struct": {
                              "number": 30,
                              "unit": "cm"
                          },
                          "values": [
                              {
                                  "id": null,
                                  "name": "30 cm",
                                  "struct": {
                                      "number": 30,
                                      "unit": "cm"
                                  },
                                  "source": 4954751883138633
                              }
                          ],
                          "source": 4954751883138633,
                          "value_type": "number_unit"
                      },
                      {
                          "id": "PACKAGE_LENGTH",
                          "name": "Package length",
                          "value_id": null,
                          "value_name": "30 cm",
                          "value_struct": {
                              "number": 30,
                              "unit": "cm"
                          },
                          "values": [
                              {
                                  "id": null,
                                  "name": "30 cm",
                                  "struct": {
                                      "number": 30,
                                      "unit": "cm"
                                  },
                                  "source": 4954751883138633
                              }
                          ],
                          "source": 4954751883138633,
                          "value_type": "number_unit"
                      },
                      {
                          "id": "PACKAGE_WEIGHT",
                          "name": "Package weight",
                          "value_id": null,
                          "value_name": "1 kg",
                          "value_struct": {
                              "number": 1,
                              "unit": "kg"
                          },
                          "values": [
                              {
                                  "id": null,
                                  "name": "1 kg",
                                  "struct": {
                                      "number": 1,
                                      "unit": "kg"
                                  },
                                  "source": 4954751883138633
                              }
                          ],
                          "source": 4954751883138633,
                          "value_type": "number_unit"
                      },
                      {
                          "id": "PACKAGE_WIDTH",
                          "name": "Package width",
                          "value_id": null,
                          "value_name": "30 cm",
                          "value_struct": {
                              "number": 30,
                              "unit": "cm"
                          },
                          "values": [
                              {
                                  "id": null,
                                  "name": "30 cm",
                                  "struct": {
                                      "number": 30,
                                      "unit": "cm"
                                  },
                                  "source": 4954751883138633
                              }
                          ],
                          "source": 4954751883138633,
                          "value_type": "number_unit"
                      },
                      {
                          "id": "GTIN",
                          "name": "Universal product code",
                          "value_id": null,
                          "value_name": "7899680328732",
                          "value_struct": null,
                          "values": [
                              {
                                  "id": null,
                                  "name": "7899680328732",
                                  "struct": null,
                                  "source": 4954751883138633
                              }
                          ],
                          "source": 4954751883138633,
                          "value_type": "string"
                      }
                  ],
                  "inventory_id": null,
              },
              {
                  "id": 175669183151,
                  "price": 12,
                  "attribute_combinations": [
                      {
                          "id": "COLOR",
                          "name": "Color",
                          "value_id": "52028",
                          "value_name": "Blue",
                          "value_struct": null,
                          "values": [
                              {
                                  "id": "52028",
                                  "name": "Blue",
                                  "struct": null,
                                  "source": 3376461333454861
                              }
                          ],
                          "source": 3376461333454861,
                          "value_type": "string"
                      },
                      {
                          "id": "SIZE",
                          "name": "Size",
                          "value_id": "469803",
                          "value_name": "6 US-M",
                          "value_struct": null,
                          "values": [
                              {
                                  "id": "",
                                  "name": "6 US-M",
                                  "struct": null,
                                  "source": 3376461333454861
                              }
                          ],
                          "source": 3376461333454861,
                          "value_type": "string"
                      }
                  ],
                  "available_quantity": 2,
                  "sold_quantity": 0,
                  "sale_terms": [],
                  "picture_ids": [
                      "862503-CBT51700450573_092022"
                  ],
                  "seller_custom_field": null,
                  "catalog_product_id": null,
                  "attributes": [
                      {
                          "id" :"SIZE_GRID_ROW_ID",
                          "value_name": "664737:2"
                      },
                      {
                          "id": "MAIN_COLOR",
                          "name": "Main color",
                          "value_id": "2450293",
                          "value_name": "Blue",
                          "value_struct": null,
                          "values": [
                              {
                                  "id": "2450293",
                                  "name": "Blue",
                                  "struct": null,
                                  "source": 3376461333454861
                              }
                          ],
                          "source": 3376461333454861,
                          "value_type": "list"
                      },
                      {
                          "id": "PACKAGE_HEIGHT",
                          "name": "Package height",
                          "value_id": null,
                          "value_name": "30 cm",
                          "value_struct": {
                              "number": 30,
                              "unit": "cm"
                          },
                          "values": [
                              {
                                  "id": null,
                                  "name": "30 cm",
                                  "struct": {
                                      "number": 30,
                                      "unit": "cm"
                                  },
                                  "source": 3376461333454861
                              }
                          ],
                          "source": 3376461333454861,
                          "value_type": "number_unit"
                      },
                      {
                          "id": "PACKAGE_LENGTH",
                          "name": "Package length",
                          "value_id": null,
                          "value_name": "30 cm",
                          "value_struct": {
                              "number": 30,
                              "unit": "cm"
                          },
                          "values": [
                              {
                                  "id": null,
                                  "name": "30 cm",
                                  "struct": {
                                      "number": 30,
                                      "unit": "cm"
                                  },
                                  "source": 3376461333454861
                              }
                          ],
                          "source": 3376461333454861,
                          "value_type": "number_unit"
                      },
                      {
                          "id": "PACKAGE_WEIGHT",
                          "name": "Package weight",
                          "value_id": null,
                          "value_name": "1 kg",
                          "value_struct": {
                              "number": 1,
                              "unit": "kg"
                          },
                          "values": [
                              {
                                  "id": null,
                                  "name": "1 kg",
                                  "struct": {
                                      "number": 1,
                                      "unit": "kg"
                                  },
                                  "source": 3376461333454861
                              }
                          ],
                          "source": 3376461333454861,
                          "value_type": "number_unit"
                      },
                      {
                          "id": "PACKAGE_WIDTH",
                          "name": "Package width",
                          "value_id": null,
                          "value_name": "30 cm",
                          "value_struct": {
                              "number": 30,
                              "unit": "cm"
                          },
                          "values": [
                              {
                                  "id": null,
                                  "name": "30 cm",
                                  "struct": {
                                      "number": 30,
                                      "unit": "cm"
                                  },
                                  "source": 3376461333454861
                              }
                          ],
                          "source": 3376461333454861,
                          "value_type": "number_unit"
                      },
                      {
                          "id": "GTIN",
                          "name": "Universal product code",
                          "value_id": null,
                          "value_name": "7899680328732",
                          "value_struct": null,
                          "values": [
                              {
                                  "id": null,
                                  "name": "7899680328732",
                                  "struct": null,
                                  "source": 3376461333454861
                              }
                          ],
                          "source": 3376461333454861,
                          "value_type": "string"
                      }
                  ],
                  "inventory_id": null,
                  "item_relations": []
              }
          ],
          "status": "active",
          "tags": [
              "test_item",
              "immediate_payment"
          ],
          "warranty": "No warranty",
          "catalog_product_id": null,
          "domain_id": "CBT-SNEAKERS",
          "seller_custom_field": null,
          "automatic_relist": false,
          "catalog_listing": false,
          "channels": [
              "marketplace"
          ]
       }'

Response: Success 201


{
        "id": "CBT1727681183",
        "site_id": "CBT",
        "title": "Create Item With - Gdt Sneaker Man ",
        "subtitle": null,
        "seller_id": 1161438226,
        "category_id": "CBT3724",
        "user_product_id": null,
        "official_store_id": null,
        "price": 12,
        "base_price": 12,
        "original_price": null,
        "inventory_id": null,
        "currency_id": "USD",
        "initial_quantity": 7,
        "available_quantity": 7,
        "sold_quantity": 0,
        "sale_terms": [
            {
                "id": "WARRANTY_TYPE",
                "name": "Warranty type",
                "value_id": "6150835",
                "value_name": "No warranty",
                "value_struct": null,
                "values": [
                    {
                        "id": "6150835",
                        "name": "No warranty",
                        "struct": null
                    }
                ],
                "value_type": "list"
            }
        ],
        "buying_mode": "buy_it_now",
        "listing_type_id": "gold_pro",
        "start_time": "2023-06-30T19:33:34.795Z",
        "stop_time": "2043-06-25T04:00:00.000Z",
        "end_time": "2043-06-25T04:00:00.000Z",
        "expiration_time": "2023-09-18T19:33:34.902Z",
        "condition": "new",
        "permalink": "",
        "pictures": [
            {
                "id": "644516-CBT51699767208_092022",
                "url": "http://cbt-s1-p.mlstatic.com/644516-CBT51699767208_092022-O.jpg",
                "secure_url": "https://cbt-s1-p.mlstatic.com/644516-CBT51699767208_092022-O.jpg",
                "size": "500x247",
                "max_size": "1200x595",
                "quality": ""
            },
            {
                "id": "862503-CBT51700450573_092022",
                "url": "http://cbt-s2-p.mlstatic.com/862503-CBT51700450573_092022-O.jpg",
                "secure_url": "https://cbt-s2-p.mlstatic.com/862503-CBT51700450573_092022-O.jpg",
                "size": "500x247",
                "max_size": "1200x594",
                "quality": ""
            }
        ],
        "video_id": null,
        "descriptions": [],
        "accepts_mercadopago": true,
        "non_mercado_pago_payment_methods": [],
        "shipping": {
            "mode": "not_specified",
            "local_pick_up": false,
            "free_shipping": false,
            "methods": [],
            "dimensions": null,
            "tags": [],
            "logistic_type": "not_specified",
            "store_pick_up": false
        },
        "international_delivery_mode": "none",
        "seller_address": {
            "id": 1288377745,
            "comment": "",
            "address_line": "No.999 shangai road, shensei District",
            "zip_code": "518033",
            "city": {
                "id": "Q04tR0RTaGVuemhlbg",
                "name": "Shenzhen"
            },
            "state": {
                "id": "CN-GD",
                "name": "Guangdong"
            },
            "country": {
                "id": "CN",
                "name": "China"
            },
            "latitude": "",
            "longitude": "",
            "search_location": {
                "neighborhood": {
                    "id": "",
                    "name": ""
                },
                "city": {
                    "id": "",
                    "name": ""
                },
                "state": {
                    "id": "",
                    "name": ""
                }
            }
        },
        "seller_contact": null,
        "location": {},
        "geolocation": {
            "latitude": "",
            "longitude": ""
        },
        "coverage_areas": [],
        "attributes": [
            {
                "id": "SIZE_GRID_ID",
                "name": "Size grid ID",
                "value_id": null,
                "value_name": "664737",
                "value_struct": null,
                "values": [
                    {
                        "id": null,
                        "name": "664737",
                        "struct": null
                    }
                ],
                "attribute_group_id": "OTHERS",
                "attribute_group_name": "Others",
                "value_type": "grid_id"
            },
            {
                "id": "BRAND",
                "name": "Brand",
                "value_id": "10331273",
                "value_name": "Generic",
                "value_struct": null,
                "values": [
                    {
                        "id": "10331273",
                        "name": "Generic",
                        "struct": null
                    }
                ],
                "attribute_group_id": "OTHERS",
                "attribute_group_name": "Others",
                "value_type": "string"
            },
            {
                "id": "FOOTWEAR_TYPE",
                "name": "Footwear type",
                "value_id": "517583",
                "value_name": "Sneaker",
                "value_struct": null,
                "values": [
                    {
                        "id": "517583",
                        "name": "Sneaker",
                        "struct": null
                    }
                ],
                "attribute_group_id": "OTHERS",
                "attribute_group_name": "Others",
                "value_type": "list"
            },
            {
                "id": "GENDER",
                "name": "Gender",
                "value_id": "339666",
                "value_name": "Man",
                "value_struct": null,
                "values": [
                    {
                        "id": "339666",
                        "name": "Man",
                        "struct": null
                    }
                ],
                "attribute_group_id": "OTHERS",
                "attribute_group_name": "Others",
                "value_type": "list"
            },
            {
                "id": "ITEM_CONDITION",
                "name": "Item condition",
                "value_id": "2230284",
                "value_name": "New",
                "value_struct": null,
                "values": [
                    {
                        "id": "2230284",
                        "name": "New",
                        "struct": null
                    }
                ],
                "attribute_group_id": "OTHERS",
                "attribute_group_name": "Others",
                "value_type": "list"
            },
            {
                "id": "MODEL",
                "name": "Model",
                "value_id": null,
                "value_name": "generic",
                "value_struct": null,
                "values": [
                    {
                        "id": null,
                        "name": "generic",
                        "struct": null
                    }
                ],
                "attribute_group_id": "OTHERS",
                "attribute_group_name": "Others",
                "value_type": "string"
            },
            {
                "id": "STYLE",
                "name": "Style",
                "value_id": "6694773",
                "value_name": "Urban",
                "value_struct": null,
                "values": [
                    {
                        "id": "6694773",
                        "name": "Urban",
                        "struct": null
                    }
                ],
                "attribute_group_id": "OTHERS",
                "attribute_group_name": "Others",
                "value_type": "list"
            }
        ],
        "warnings": [
            {
                "department": "structured-data",
                "cause_id": 1212,
                "code": "normalize.item.attribute.values",
                "message": "Attribute [SIZE] to be modified - values [(469803,6 US-M)] should be [(null,6 US-M)] - Normalized form: [invalid_value_id]",
                "references": [
                    "item.variations[1].attribute_combinations[1].values"
                ]
            },
            {
                "department": "items",
                "cause_id": 303,
                "code": "item.attributes.ignored",
                "message": "Attribute [AGE_GROUP] ignored because it is not modifiable.",
                "references": [
                    "item.attributes"
                ]
            },
            {
                "department": "structured-data",
                "cause_id": 1212,
                "code": "normalize.item.attribute.values",
                "message": "Attribute [SIZE] to be modified - values [(469803,5 US-M)] should be [(null,5 US-M)] - Normalized form: [invalid_value_id]",
                "references": [
                    "item.variations[0].attribute_combinations[1].values"
                ]
            },
            {
                "department": "shipping",
                "cause_id": 4053,
                "code": "shipping.lost_me1_by_user",
                "message": "User has not mode me1",
                "references": [
                    "user.shipping_preferences.modes"
                ]
            },
            {
                "department": "structured-data",
                "cause_id": 1212,
                "code": "normalize.item.attribute.values",
                "message": "Attribute [COLOR] to be modified - values [(2450295,Black)] should be [(52049,Black)] - Normalized form: [suggested_values]",
                "references": [
                    "item.variations[0].attribute_combinations[0].values"
                ]
            },
            {
                "department": "structured-data",
                "cause_id": 2511,
                "code": "create.item.attribute.business_conditional",
                "message": "Attribute [FILTRABLE_GENDER] to be added with values [(18549360,null)]",
                "references": [
                    "item.attributes"
                ]
            },
            {
                "department": "structured-data",
                "cause_id": 1212,
                "code": "normalize.item.attribute.values",
                "message": "Attribute [BRAND] to be modified - values [(10331273,Generic)] should be [(276243,Genérica)] - Normalized form: [migration]",
                "references": [
                    "item.attributes[2].values"
                ]
            },
            {
                "department": "structured-data",
                "cause_id": 1011,
                "code": "normalize.item.attribute.name",
                "message": "Attribute [AGE_GROUP] to be modified - name [Age] should be [Age group]",
                "references": [
                    "item.attributes[1].name"
                ]
            },
            {
                "department": "shipping",
                "cause_id": 4054,
                "code": "shipping.lost_me1_by_catalog",
                "message": "Catalog has not mode me1",
                "references": [
                    "catalog.shipping_preferences.modes"
                ]
            }
        ],
        "listing_source": "",
        "variations": [
            {
                "id": 178848074405,
                "attribute_combinations": [
                    {
                        "id": "COLOR",
                        "name": "Color",
                        "value_id": "2450295",
                        "value_name": "Black",
                        "value_struct": null,
                        "values": [
                            {
                                "id": "2450295",
                                "name": "Black",
                                "struct": null
                            }
                        ],
                        "value_type": "string"
                    },
                    {
                        "id": "SIZE",
                        "name": "Size",
                        "value_id": "469803",
                        "value_name": "5 US-M",
                        "value_struct": null,
                        "values": [
                            {
                                "id": "469803",
                                "name": "5 US-M",
                                "struct": null
                            }
                        ],
                        "value_type": "string"
                    }
                ],
                "price": 12,
                "available_quantity": 5,
                "user_product_id": "CBTU412498",
                "sold_quantity": 0,
                "sale_terms": [],
                "picture_ids": [
                    "644516-CBT51699767208_092022"
                ],
                "seller_custom_field": null,
                "catalog_product_id": null,
                "attributes": [
                    {
                        "id": "MAIN_COLOR",
                        "name": "Main color",
                        "value_id": "2450295",
                        "value_name": "Black",
                        "value_struct": null,
                        "values": [
                            {
                                "id": "2450295",
                                "name": "Black",
                                "struct": null
                            }
                        ],
                        "value_type": "list"
                    },
                    {
                        "id": "PACKAGE_HEIGHT",
                        "name": "Package height",
                        "value_id": null,
                        "value_name": "30 cm",
                        "value_struct": {
                            "number": 30,
                            "unit": "cm"
                        },
                        "values": [
                            {
                                "id": null,
                                "name": "30 cm",
                                "struct": {
                                    "number": 30,
                                    "unit": "cm"
                                }
                            }
                        ],
                        "value_type": "number_unit"
                    },
                    {
                        "id": "PACKAGE_LENGTH",
                        "name": "Package length",
                        "value_id": null,
                        "value_name": "30 cm",
                        "value_struct": {
                            "number": 30,
                            "unit": "cm"
                        },
                        "values": [
                            {
                                "id": null,
                                "name": "30 cm",
                                "struct": {
                                    "number": 30,
                                    "unit": "cm"
                                }
                            }
                        ],
                        "value_type": "number_unit"
                    },
                    {
                        "id": "PACKAGE_WEIGHT",
                        "name": "Package weight",
                        "value_id": null,
                        "value_name": "1 kg",
                        "value_struct": {
                            "number": 1,
                            "unit": "kg"
                        },
                        "values": [
                            {
                                "id": null,
                                "name": "1 kg",
                                "struct": {
                                    "number": 1,
                                    "unit": "kg"
                                }
                            }
                        ],
                        "value_type": "number_unit"
                    },
                    {
                        "id": "PACKAGE_WIDTH",
                        "name": "Package width",
                        "value_id": null,
                        "value_name": "30 cm",
                        "value_struct": {
                            "number": 30,
                            "unit": "cm"
                        },
                        "values": [
                            {
                                "id": null,
                                "name": "30 cm",
                                "struct": {
                                    "number": 30,
                                    "unit": "cm"
                                }
                            }
                        ],
                        "value_type": "number_unit"
                    },
                    {
                        "id": "SIZE_GRID_ROW_ID",
                        "name": "Size grid row ID",
                        "value_id": null,
                        "value_name": "664737:1",
                        "value_struct": null,
                        "values": [
                            {
                                "id": null,
                                "name": "664737:1",
                                "struct": null
                            }
                        ],
                        "value_type": "grid_row_id"
                    },
                    {
                        "id": "GTIN",
                        "name": "Universal product code",
                        "value_id": null,
                        "value_name": "7899680328732",
                        "value_struct": null,
                        "values": [
                            {
                                "id": null,
                                "name": "7899680328732",
                                "struct": null
                            }
                        ],
                        "value_type": "string"
                    }
                ],
                "inventory_id": null,
                "item_relations": []
            },
            {
                "id": 178848074407,
                "attribute_combinations": [
                    {
                        "id": "COLOR",
                        "name": "Color",
                        "value_id": "52028",
                        "value_name": "Blue",
                        "value_struct": null,
                        "values": [
                            {
                                "id": "52028",
                                "name": "Blue",
                                "struct": null
                            }
                        ],
                        "value_type": "string"
                    },
                    {
                        "id": "SIZE",
                        "name": "Size",
                        "value_id": "469803",
                        "value_name": "6 US-M",
                        "value_struct": null,
                        "values": [
                            {
                                "id": "469803",
                                "name": "6 US-M",
                                "struct": null
                            }
                        ],
                        "value_type": "string"
                    }
                ],
                "price": 12,
                "available_quantity": 2,
                "user_product_id": "CBTU412500",
                "sold_quantity": 0,
                "sale_terms": [],
                "picture_ids": [
                    "862503-CBT51700450573_092022"
                ],
                "seller_custom_field": null,
                "catalog_product_id": null,
                "attributes": [
                    {
                        "id": "MAIN_COLOR",
                        "name": "Main color",
                        "value_id": "2450293",
                        "value_name": "Blue",
                        "value_struct": null,
                        "values": [
                            {
                                "id": "2450293",
                                "name": "Blue",
                                "struct": null
                            }
                        ],
                        "value_type": "list"
                    },
                    {
                        "id": "PACKAGE_HEIGHT",
                        "name": "Package height",
                        "value_id": null,
                        "value_name": "30 cm",
                        "value_struct": {
                            "number": 30,
                            "unit": "cm"
                        },
                        "values": [
                            {
                                "id": null,
                                "name": "30 cm",
                                "struct": {
                                    "number": 30,
                                    "unit": "cm"
                                }
                            }
                        ],
                        "value_type": "number_unit"
                    },
                    {
                        "id": "PACKAGE_LENGTH",
                        "name": "Package length",
                        "value_id": null,
                        "value_name": "30 cm",
                        "value_struct": {
                            "number": 30,
                            "unit": "cm"
                        },
                        "values": [
                            {
                                "id": null,
                                "name": "30 cm",
                                "struct": {
                                    "number": 30,
                                    "unit": "cm"
                                }
                            }
                        ],
                        "value_type": "number_unit"
                    },
                    {
                        "id": "PACKAGE_WEIGHT",
                        "name": "Package weight",
                        "value_id": null,
                        "value_name": "1 kg",
                        "value_struct": {
                            "number": 1,
                            "unit": "kg"
                        },
                        "values": [
                            {
                                "id": null,
                                "name": "1 kg",
                                "struct": {
                                    "number": 1,
                                    "unit": "kg"
                                }
                            }
                        ],
                        "value_type": "number_unit"
                    },
                    {
                        "id": "PACKAGE_WIDTH",
                        "name": "Package width",
                        "value_id": null,
                        "value_name": "30 cm",
                        "value_struct": {
                            "number": 30,
                            "unit": "cm"
                        },
                        "values": [
                            {
                                "id": null,
                                "name": "30 cm",
                                "struct": {
                                    "number": 30,
                                    "unit": "cm"
                                }
                            }
                        ],
                        "value_type": "number_unit"
                    },
                    {
                        "id": "SIZE_GRID_ROW_ID",
                        "name": "Size grid row ID",
                        "value_id": null,
                        "value_name": "664737:2",
                        "value_struct": null,
                        "values": [
                            {
                                "id": null,
                                "name": "664737:2",
                                "struct": null
                            }
                        ],
                        "value_type": "grid_row_id"
                    },
                    {
                        "id": "GTIN",
                        "name": "Universal product code",
                        "value_id": null,
                        "value_name": "7899680328732",
                        "value_struct": null,
                        "values": [
                            {
                                "id": null,
                                "name": "7899680328732",
                                "struct": null
                            }
                        ],
                        "value_type": "string"
                    }
                ],
                "inventory_id": null,
                "item_relations": []
            }
        ],
        "thumbnail_id": "644516-CBT51699767208_092022",
        "thumbnail": "http://cbt-s1-p.mlstatic.com/644516-CBT51699767208_092022-I.jpg",
        "secure_thumbnail": "https://cbt-s1-p.mlstatic.com/644516-CBT51699767208_092022-I.jpg",
        "status": "active",
        "sub_status": [],
        "tags": [
            "immediate_payment",
            "test_item"
        ],
        "warranty": "No warranty",
        "catalog_product_id": null,
        "domain_id": "CBT-SNEAKERS",
        "seller_custom_field": null,
        "parent_item_id": null,
        "differential_pricing": null,
        "deal_ids": [],
        "automatic_relist": false,
        "date_created": "2023-06-30T19:33:34.972Z",
        "last_updated": "2023-06-30T19:33:34.972Z",
        "health": null,
        "catalog_listing": false,
        "item_relations": [],
        "channels": [
            "marketplace"
        ]
    }

Result items with size chart

The publication result in Mercado Libre is that:

Notes:
After the creation of the item we run an automation that makes an update to the rows of the size chart for each site.
The international size chart becomes a local guide for publication on the site.

Next: Validations