The increment of time that a subscription period is specified in.
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@property(nonatomic, readonly) SKProductPeriodUnit unit;
The units used to specify a subscription period include day, week, month, and year, as defined in SKProductPeriodUnit.
To calculate the duration of one subscription period, multiply the unit by the number of units (numberOfUnits).
The number of units per subscription period.
Values representing the duration of an interval, from a day up to a year.