---
title: "Update event custom field responses"
method: PUT
path: "/v2/events/{eventId}/custom-field-responses"
tags: ["Events"]
---

# Update event custom field responses

`PUT /v2/events/{eventId}/custom-field-responses`

Update the response to a custom field question.

## Request body

- EventCustomFieldResponsesRequest — Request for updating custom field responses for an event
  - `eventCustomFieldResponses` CustomFieldResponse[] — List of custom field responses for an event.
    - `customFieldId` string, uuid, required — The unique identifier for the custom field.
    - `responseItems` CustomFieldResponseItem[] — Responses selected by the event coordinator.
      - `response` string, required — The response of the custom field. It can be a text input from the user or a custom field code if the input is from a radio button or checkbox.
      - `additionalInput` string — This contains additional input to the above response. It will only be used for checkbox with percentage and will contain the percentage value.
    - `travelerAccess` 'HIDDEN' | 'READ_ACCESS' | 'WRITE_ACCESS', required — Traveler access for a custom field
  - `customFieldV3Responses` CustomFieldPrefilledResponse[] — List of custom field responses for an event.
    - `fieldId` string, uuid, required — Custom field id
    - `fieldName` string — Name of the custom field
    - `armId` string, uuid, required — Arm id which is applicable
    - `readOnly` boolean — Indicates whether the user can change the pre-selected options.
    - `hidden` boolean — Whether this code will be hidden to the user.
    - `selectedOptions` CustomFieldSelectedOption[], required — The list of options that are selected by user or auto populated.
      - `name` string, required — Value of the selection
      - `translatedName` string — Translated value of the selection
      - `description` string — Description of the selection
      - `translatedDescription` string — Translated description of the selection
      - `additionalUserInput` string — Additional user input
      - `additionalInfos` string[] — Actual values of the additional infos
      - `additionalInfoConfigs` AdditionalInfo[] — Additional info configs for the selected option
        - union — Additional data need to be sent along with the custom field response.
          - object — Variable defining the additional value to be sent along with custom field response.
            - `type` string, required
            - `name` 'PUBLISHED_FARE' | 'LLF' | 'ADD_COLLECT_AMOUNT' | 'SELECTED_FARE' | 'SPLIT_PAYMENT_FARE', required — Name of the variable.
          - object — Expression consisting of variables and constants which needs to be sent along with custom field response.
            - `type` string, required
            - `formatExpression` string, required — The expression must be of format : `<any_text> ${expression} <any_text>`.The expression can consist of a combination of variables and mathematical operations. Variable names must be same as VariableName Enum. To define mathematical operations, the operation name should follow the format `math.<math_op>(arg1, arg2)`. Both `arg1` and `arg2` can be variables or constants. The supported math operations (math_op) include: `add, mul, div, sub, min, and max`. All keywords, such as `<math_op>, math, and var` must be written in lowercase.
            - `variables` VariableName[] — Reference names of the variables present in the expression.

## Response `200`

OK

## Other responses

- `400` — Bad request
- `401` — Unauthorized
- `403` — Forbidden

---

[API](https://skmtc.net/spotnana/apis/event-api.md) · [All operations](https://skmtc.net/spotnana/apis/event-api/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/spotnana/event-api/revisions/9f7a7c91278c/schema)