# UpdateCustomFieldsInput

Input · GraphQL API

Input for creating or updating custom fields on a transaction or a refund.

## Fields

- `clientMutationId` (`String`): An identifier used to reconcile requests and responses. 255 characters maximum.
- `id` (`ID!`) — required: The ID of the transaction or the refund to update.
- `customFields` (`[CustomFieldInput!]!`) — required: The list of custom fields to update. You must [set up each custom field in the Control Panel](https://articles.braintreepayments.com/control-panel/custom-fields#creating-a-custom-field) prior to passing it with a request.

## Used by

- [updateCustomFields](/braintree/graphql/reference/mutations/update-custom-fields) — Mutation; input

## GraphQL definition

```graphql
input UpdateCustomFieldsInput {
  clientMutationId: String
  id: ID!
  customFields: [CustomFieldInput!]!
}
```

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[View the complete GraphQL schema on GitHub](https://raw.githubusercontent.com/braintree/graphql-api/refs/heads/master/schema.graphql)