transactions method

Implementation

Future<List<SKPaymentTransactionWrapper>> transactions() async {
  final List<SKPaymentTransactionMessage?> pigeonMsgs = await _hostApi
      .transactions();
  return pigeonMsgs
      .map(
        (SKPaymentTransactionMessage? msg) =>
            SKPaymentTransactionWrapper.convertFromPigeon(msg!),
      )
      .toList();
}