The legacy identifier for this rate plan, if any.
{ "$schema": "https://json-schema.org/draft/2020-12/schema", "$id": "#/components/schemas/bill-subs-api_legacy_id", "title": "bill-subs-api_legacy_id", "description": "The legacy identifier for this rate plan, if any.", "example": "free", "readOnly": true, "type": "string" }