# `Stripe.Params.InvoiceCreatePreviewParams.SubscriptionDetails.BillingMode`
[🔗](https://github.com/jeffhuen/tiger_stripe/blob/main/lib/stripe/params/invoice_create_preview_params.ex#L672)

Nested parameters.

# `t`

```elixir
@type t() ::
  %Stripe.Params.InvoiceCreatePreviewParams.SubscriptionDetails.BillingMode{
    flexible:
      Stripe.Params.InvoiceCreatePreviewParams.SubscriptionDetails.BillingMode.Flexible.t()
      | nil,
    type: String.t() | nil
  }
```

* `flexible` - Configure behavior for flexible billing mode.
* `type` - Controls the calculation and orchestration of prorations and invoices for subscriptions. If no value is passed, the default is `flexible`. Possible values: `classic`, `flexible`.

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