handleIosSwitchPlan method
Handles the Up and Downgrade of a Subscription plans Apple does not need the existing plan.
Implementation
Future<bool> handleIosSwitchPlan(LinkFiveProductDetails productDetails) async {
// init the purchase
return InAppPurchase.instance
.buyNonConsumable(purchaseParam: PurchaseParam(productDetails: productDetails.productDetails));
}