[
  {
    "id": "sbc_bronze_upgrade",
    "name": "Bronze Upgrade",
    "description": "Submit 11 bronze players for a silver pack.",
    "requirements": {
      "squad_size": 11,
      "min_overall": null,
      "max_overall": 64,
      "min_chemistry": null,
      "required_leagues": [],
      "required_nations": [],
      "required_clubs": [],
      "min_players_from_same_league": null,
      "min_players_from_same_nation": null,
      "min_players_from_same_club": null
    },
    "reward": {
      "coins": 0,
      "xp": 200,
      "pack_id": "silver_pack"
    },
    "expires_at": null,
    "repeatable": true
  },
  {
    "id": "sbc_hybrid_nations",
    "name": "Hybrid Nations",
    "description": "Build a squad of 11 players with at least one Brazilian and one Argentinian.",
    "requirements": {
      "squad_size": 11,
      "min_overall": 70,
      "max_overall": null,
      "min_chemistry": null,
      "required_leagues": [],
      "required_nations": ["Brazil", "Argentina"],
      "required_clubs": [],
      "min_players_from_same_league": null,
      "min_players_from_same_nation": null,
      "min_players_from_same_club": null
    },
    "reward": {
      "coins": 2000,
      "xp": 400,
      "pack_id": "gold_pack"
    },
    "expires_at": null,
    "repeatable": false
  }
]