{
  "fields": [
    {"column": "order_id", "path": "order.id"},
    {"column": "customer_name", "path": "customer.name"},
    {"column": "customer_email", "path": "customer.email", "transform": "lower", "default": ""},
    {"column": "total_usd", "path": "order.total", "transform": "decimal_2"},
    {"column": "paid", "path": "order.paid", "transform": "boolean"},
    {"column": "tags", "path": "tags", "transform": "join_pipe"}
  ]
}