Argument 1: cannot convert from 'string' to 'string[]'

Question

I get the following error after updating my Plugin.InAppBilling NuGet package from version 7.1.3 to 8.0.5.

var resultfin = await billing.FinalizePurchaseAsync(purchase.TransactionIdentifier);

Argument 1: cannot convert from 'string' to 'string[]'

How can I solve this error?

var billing = CrossInAppBilling.Current;  
try   
{
      var connected = await billing.ConnectAsync();

      if (connected == true)
      {
          var purchases = await billing.GetPurchasesAsync(ItemType.InAppPurchase);      

          int purchaseditems = purchases.Count();     
          if (purchaseditems > 0)     
          {         
              foreach (var purchase in purchases)           
              {             
                  if (purchase.ProductId != null)              
                  {   
                      if (purchase.State == Plugin.InAppBilling.PurchaseState.Purchased)    
                      {      
                           var resultfin = await billing.FinalizePurchaseAsync(purchase.TransactionIdentifier);

Answer 1

To solve the compilation error:

var resultfin = await billing.FinalizePurchaseAsync( new string[] { purchase.TransactionIdentifier } );

or

var resultfin = await billing.FinalizePurchaseAsync( [purchase.TransactionIdentifier] );

If it is a third-party library, then check the corresponding documentation.