# `Stripe.Params.InvoiceCreatePreviewParams.ScheduleDetails.Phases.AddInvoiceItems.Period.Start`
[🔗](https://github.com/jeffhuen/tiger_stripe/blob/main/lib/stripe/params/invoice_create_preview_params.ex#L424)

Nested parameters.

# `t`

```elixir
@type t() ::
  %Stripe.Params.InvoiceCreatePreviewParams.ScheduleDetails.Phases.AddInvoiceItems.Period.Start{
    timestamp: integer() | nil,
    type: String.t() | nil
  }
```

* `timestamp` - A precise Unix timestamp for the start of the invoice item period. Must be less than or equal to `period.end`. Format: Unix timestamp.
* `type` - Select how to calculate the start of the invoice item period. Possible values: `max_item_period_start`, `phase_start`, `timestamp`.

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