The amount of time – in calendar units such as day, month, or year – that represents a fraction of the total payment interval. For example, if you set the intervalUnit to 'month' and intervalCount to 3, then the payment interval is three months.
The number of interval units that make up the total payment interval. For example, if you set the intervalUnit to 'month' and intervalCount to 3, then the payment interval is three months.
Optional
startDate?: numberThe unix timestamp of the start date. Measured in seconds.
Optional
endDate?: numberThe unix timestamp of the end date. Measured in seconds.
Use this type for payments that occur more than once, such as a subscription. Only available on iOS 15 and up, otherwise falls back to ImmediateCartSummaryItem.