Steps to reproduce

When I tested on Apple Sandbox In-App Purchase, I noticed that transactionDate is returning yyyy-MM-dd HH:mm:ss instead of a timestamp.
My library version is in_app_purchase: 3.2.3.

Expected results

Return a timestamp as in the documentation.

/// The timestamp of the transaction.
/// Milliseconds since epoch.
  

Actual results

TransactionDate is returning yyyy-MM-dd HH:mm:ss

Code sample

purchasedDate = DateTime.fromMillisecondsSinceEpoch(int.parse(purchaseDetails.transactionDate!));

Screenshots or Video

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