curl --request GET \
  --url https://matcher.sandbox.lerian.net/v1/contexts/{contextId}/field-maps \
  --header 'Authorization: Bearer <token>'

{
  "hasMore": true,
  "items": [
    {
      "contextId": "<string>",
      "createdAt": "<string>",
      "id": "<string>",
      "mapping": {},
      "sourceId": "<string>",
      "updatedAt": "<string>",
      "version": 123
    }
  ],
  "limit": 100,
  "nextCursor": "<string>",
  "prevCursor": "<string>"
}