List submissions for an opportunity

{
  "data": [
    {
      "id": "string",
      "opportunity_id": "string",
      "status": "in_progress",
      "participant_id": "string",
      "created_at": "string",
      "updated_at": "string"
    }
  ],
  "pagination": {
    "next_cursor": "string",
    "has_more": true
  }
}

{
  "code": "BAD_REQUEST",
  "message": "Invalid input data",
  "issues": []
}

{
  "code": "UNAUTHORIZED",
  "message": "Authorization not provided",
  "issues": []
}

{
  "code": "FORBIDDEN",
  "message": "Insufficient access",
  "issues": []
}

{
  "code": "NOT_FOUND",
  "message": "Not found",
  "issues": []
}

{
  "code": "INTERNAL_SERVER_ERROR",
  "message": "Internal server error",
  "issues": []
}