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# B2BExtraFieldDefinition

GraphQL interface

The definition of a merchant-configured B2B extra field, describing how the field should be presented and validated.

Reference: https://docs.bigcommerce.com/developer/api-reference/graphql/storefront/types/interfaces/b-2-b-extra-field-definition

## Fields

- `fieldName` — The identifier used when reading or writing a value for this extra field.
- `labelName` — The label to display for the extra field.
- `isRequired` — Whether a value for this extra field is required.
- `visibleToEndUser` — Whether the merchant has made this extra field visible to storefront shoppers.

## Implemented by

- B2BDropdownExtraFieldDefinition
- B2BMultilineTextExtraFieldDefinition
- B2BNumberExtraFieldDefinition
- B2BTextExtraFieldDefinition

## Definition

```graphql
interface B2BExtraFieldDefinition {
  fieldName: String!
  labelName: String!
  isRequired: Boolean!
  visibleToEndUser: Boolean!
}
```