Need to send applicationUsername to my Server to validate Receipt

Hi, I'm stuck with an issue, I need to send applicationUsername to my Server so i can validate the receipt for auto renewable Subscriptions for Store kit 2 in app purchases. For this purpose I"m using a third party SwiftyStoreKit this function has a parameter to send applicationUsername to the receipt along the product ID.

I used to send the parameters but i'm not getting this in new Receipt format, after decoding the receipt on the server i found no applicationUsername in the receipt.

If anyone can help me with this please answer this, I'm new here in community.

Here is the function which i'm using to send the product id and applicationUsername

     
    print("purchase productID = \(purchase)")
     
    NetworkActivityIndicatorManager.networkOperationStarted()
    SwiftFTUtils.showHUDAdded(to: vc.view, withText: "", animated: true)
    SwiftyStoreKit.purchaseProduct(purchase, atomically: atomically,applicationUsername: userId) { result in
      NetworkActivityIndicatorManager.networkOperationFinished()
      SwiftFTUtils.hideHUDAdded(to: vc.view, animated: true)
      print("purchase result = \(result)")
      if case .success(let purchase) = result {
        self.validateServerPurchase(purchase: purchase, vc: vc)
        NotificationCenter.default.post(name: NSNotification.Name("RELOAD_DASHBOARD"), object: nil)
        AppDelegateShared().setupDrawer(0)
      }
      if let alert = vc.alertForPurchaseResult(result) {
        vc.showAlert(alert)
      }
    }
  }