{"code":"unknown_category","type":"https://developers.stylumia.com/errors/unknown_category","status":400,"title":"Unknown category","retryable":false,"meaning":"The `category` value is not recognised for the retailer you queried.","causes":["The value was guessed rather than taken from a coverage response.","The category exists for a different retailer, but not this one."],"recovery":"Call `GET /v1/coverage?retailer=...` to list that retailer's categories, or use one of the suggestions in `valid_options`.","extensions":["field","valid_options"]}