# `Stripe.Resources.Billing.Meter.DefaultAggregation`
[🔗](https://github.com/jeffhuen/tiger_stripe/blob/main/lib/stripe/resources/billing/meter.ex#L78)

Nested struct within the parent resource.

# `t`

```elixir
@type t() :: %Stripe.Resources.Billing.Meter.DefaultAggregation{
  formula: String.t() | nil
}
```

* `formula` - Specifies how events are aggregated. Possible values: `count`, `last`, `sum`.

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*Consult [api-reference.md](api-reference.md) for complete listing*