feat: addressed comments

README.md

@@ -164,7 +164,7 @@ const customer: Customer = {
     lastName: 'lname',
     email: '[email protected]',
 };
-const productType = ProductType.non_consumable
+const productType = ProductType.NON_CONSUMABLE
 try {
     const result: OneTimePurchase = await Chargebee.purchaseNonSubscriptionProduct("product-id", productType, customer);
     console.log(result);
@@ -177,7 +177,7 @@ The given code defines a function named `purchaseNonSubscriptionProduct` in the
 
 - `product`: An instance of `Product` class, representing the product to be purchased from the Apple App Store or Google Play Store.
 - `customer`: Optional. An instance of `CBCustomer` class, initialized with the customer's details such as `customerId`, `firstName`, `lastName`, and `email`.
-- `productType`: An enum instance of `productType` type, indicating the type of product to be purchased. It can be either .`consumable`, or `non_consumable`, or `non_renewing_subscription`. Note that `non_renewing_subscription` is supported only in Apple App Store.
+- `productType`: An enum instance of `productType` type, indicating the type of product to be purchased. It can be either .`consumable`, or `non_consumable`, or `non_renewing_subscription` Note that `non_renewing_subscription` is supported only in Apple App Store.
 
 The function is called asynchronously, and it returns a `Result` object with a `success` or `failure` case, as mentioned are below.
 - If the purchase is successful, it returns `OneTimePurchase` object. which includes the `invoiceId`, `chargeId`, and `customerId` associated with the purchase.
@@ -324,7 +324,7 @@ const customer: Customer = {
     lastName: 'lname',
     email: '[email protected]',
 };
-const productType = ProductType.non_consumable
+const productType = ProductType.NON_CONSUMABLE
 try {
     const result: OneTimePurchase = await Chargebee.validateReceiptForNonSubscriptions(productId, productType, customer)
 } catch (error) {

ios/ChargebeeHelper.swift

@@ -289,7 +289,7 @@ public class ChargebeeHelper: NSObject {
 }
 
 private func convertStringToProductType(productTypeString: String)-> ProductType{
-    let productType: ProductType!
+    let productType: ProductType
     if productTypeString == ProductType.Consumable.rawValue{
         productType = .Consumable
     }else if productTypeString == ProductType.NonConsumable.rawValue{