List option types

import { createAdminClient } from '@spree/admin-sdk'

const client = createAdminClient({
  baseUrl: 'https://your-store.com',
  secretKey: 'sk_xxx',
})

const { data: optionTypes } = await client.optionTypes.list()

spree api get /option_types

{
  "data": [
    {
      "id": "opt_UkLWZg9DAJ",
      "name": "foo-size-1",
      "label": "Size",
      "position": 1,
      "kind": "dropdown",
      "metadata": {},
      "filterable": true,
      "created_at": "2026-07-24T18:11:11.713Z",
      "updated_at": "2026-07-24T18:11:11.713Z"
    }
  ],
  "meta": {
    "page": 1,
    "limit": 25,
    "count": 1,
    "pages": 1,
    "from": 1,
    "to": 1,
    "in": 1,
    "previous": null,
    "next": null
  }
}

{
  "error": {
    "code": "authentication_required",
    "message": "Authentication required"
  }
}