Errors

Errors share one shape:

{ "error": { "code": "not_found", "message": "Asset not found." } }

Status	Code	What to do
400	`invalid_request`	Fix the query parameter named in `message`.
401	`invalid_token`	The token expired or was revoked. Refresh, then retry once.
404	`not_found`	The asset, company, or route doesn’t exist, or you don’t have access to it.
405	`method_not_allowed`	Only `GET` is supported.
500	`server_error`	Retry with backoff.

The token endpoint uses standard OAuth errors: {"error": "invalid_grant", "error_description": "…"}.