{
  "strategies": [
    {"name": "default_calculator", "class": "Calculators::DefaultCalculator", "description": "Standard calculation using base rules"},
    {"name": "discount_calculator", "class": "Calculators::DiscountCalculator", "description": "Applies discounts for eligible accounts"},
    {"name": "null_calculator", "class": "Calculators::NullCalculator", "description": "Returns zero values — safe fallback"}
  ],
  "factory": {
    "lookup_order": ["default_calculator", "discount_calculator", "null_calculator"],
    "default": "default_calculator"
  }
}