/// <summary>
/// Restores all previous purchases
/// </summary>
/// <param name="productType">Not used of iOS</param>
/// <returns>An array of previous purchases</returns>
public async Task <List <InAppPurchaseResult> > RestoreAsync(ProductType productType)
{
TaskCompletionSource <List <InAppPurchaseResult> > transactionsRestored = new TaskCompletionSource <List <InAppPurchaseResult> >();
_paymentObserver.SetTransactionRestoreTask(transactionsRestored);
// Start receiving restored transactions
SKPaymentQueue.DefaultQueue.RestoreCompletedTransactions();
List <InAppPurchaseResult> list = await transactionsRestored.Task;
return(list);
}
