Bulk create export template attributes

Creates up to 500 attributes on an export template in a single request (an export template supports at most 5000 attributes in total). Each entry follows the same requirements as creating a single attribute and must carry a unique requestKey that identifies it in the response. **Duplicate names.** An entry whose fieldName already exists on the export template, or appears earlier in the same request, is not created. Names are compared case-insensitively, so `Color` and `color` are the same attribute. That entry comes back with a `message` in its `errors` and no entity id, and the other entries are still created. **Order.** An entry without an `order` is placed after the attributes the export template already has, in the order of the request: it gets the template's highest `order` plus one, the next such entry plus two, and so on. An entry with an `order` keeps it. **Publishing required.** This request stores a draft. The change becomes available in the Productsup platform only after you publish the export template with `POST /V1/export-templates/{id}/commit`.

curl -X POST "https://export-template-api.productsup.com/V1/export-templates/string/attributes/bulk-create" \  -H "Content-Type: application/json" \  -d '{    "entries": [      {        "requestKey": "1",        "exportField": {          "fieldName": "color",          "alias": "some alias",          "mandatory": true,          "flag": "colors",          "isDefaultTrackingColumn": true,          "isUniqueColumn": true,          "order": 5,          "deltaIgnore": true,          "deltaKey": true,          "automapIgnore": true,          "description": "some description",          "format": "String (Unicode Characters)",          "examples": [            "some example"          ]        }      },      {        "requestKey": "2",        "exportField": {          "fieldName": "brand",          "mandatory": false,          "order": 2        }      },      {        "requestKey": "3",        "exportField": {          "fieldName": "size",          "order": 3        }      }    ]  }'

{
  "data": [
    {
      "errors": [],
      "requestKey": "1",
      "details": {
        "entityId": 995308
      }
    },
    {
      "errors": [],
      "requestKey": "2",
      "details": {
        "entityId": 995309
      }
    },
    {
      "errors": {
        "message": "Attribute \"color\" already exists and cannot be added again."
      },
      "requestKey": "3"
    }
  ]
}

{
  "errors": {
    "message": "Request validation has encountered constraint violations.",
    "errors": {
      "entries": [
        "This collection should contain 500 elements or less."
      ]
    }
  }
}

{
  "errors": {
    "message": "Resource access denied."
  }
}