# Get individual custom entity by ID Returns a single custom entity owned by the authenticated user, including all addresses for that entity. This endpoint always includes the full entity data with addresses. Endpoint: GET /user/entities/{id} Version: 1.0.0 Security: ApiKeyAuth ## Path parameters: - `id` (string, required) Unique identifier of the entity to retrieve ## Response 400 fields (application/json): - `error` (string) Example: "Bad request" ## Response 401 fields (application/json): - `error` (string) Example: "API key missing or invalid" ## Response 404 fields (application/json): - `error` (string) Example: "Not found" ## Response 500 fields