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Errors

MODIFIER_REQUIRED

MODIFIER_REQUIRED

A line item is missing a modifier selection that the catalog marks as required (e.g. a "size" group on a drink, or a "protein" group on a bowl).

Reserved error code — not currently emitted by any endpoint. Partners may begin handling it defensively; backend will start emitting once wired in.

Summary

Field	Value
HTTP status	400
errorCategory	validation
retryable	false

When This Fires

• POST /v1/marketplace/orders/validate — a line item references a catalog item whose required modifier group has fewer selections than its minSelections value.
• POST /v1/marketplace/orders/place — same condition reaches placement (typically only possible if validation was skipped).

Recommended Action

Inspect the catalog modifier groups for the offending item and surface the required selections in your UI:

1. GET /v1/marketplace/stores/{storeId}/catalog — find the line item's modifierGroups[].minSelections.
2. Prompt the user to satisfy each required group.
3. Resubmit with the populated modifier selections.

The errors[] array on the response will pinpoint the offending line item via jsonPath.

Example

Code
{
  "type": "https://developer.gett-tech.com/errors/MODIFIER_REQUIRED",
  "title": "Bad Request",
  "status": 400,
  "detail": "Line item is missing a required modifier selection.",
  "instance": "/v1/marketplace/orders/validate",
  "requestId": "req_abc123",
  "timestamp": "2026-04-27T14:30:00.000Z",
  "errorCode": "MODIFIER_REQUIRED",
  "errorCategory": "validation",
  "retryable": false
}