Write comments for public interfaces

- Write comments for the `IAPProvider`
- Write comments for the `ReceiptRefreshProvider`

Sources/Flare/Classes/Providers/IAPProvider/IAPProvider.swift

@@ -5,17 +5,31 @@
 
 import StoreKit
 
+/// A class that provides in-app purchase functionality.
 final class IAPProvider: IIAPProvider {
     // MARK: Properties
 
+    /// The queue of payment transactions to be processed by the App Store.
     private let paymentQueue: PaymentQueue
+    /// The provider is responsible for fetching StoreKit products.
     private let productProvider: IProductProvider
+    /// The provider is responsible for making in-app payments.
     private let paymentProvider: IPaymentProvider
+    /// The provider is responsible for refreshing receipts.
     private let receiptRefreshProvider: IReceiptRefreshProvider
+    /// The provider is responsible for refunding purchases
     private let refundProvider: IRefundProvider
 
     // MARK: Initialization
 
+    /// Creates a new `IAPProvider` instance.
+    ///
+    /// - Parameters:
+    ///   - paymentQueue: The queue of payment transactions to be processed by the App Store.
+    ///   - productProvider: The provider is responsible for fetching StoreKit products.
+    ///   - paymentProvider: The provider is responsible for making in-app payments.
+    ///   - receiptRefreshProvider: The provider is responsible for refreshing receipts.
+    ///   - refundProvider: The provider is responsible for refunding purchases.
     init(
         paymentQueue: PaymentQueue = SKPaymentQueue.default(),
         productProvider: IProductProvider = ProductProvider(),

Sources/Flare/Classes/Providers/ReceiptRefreshProvider/ReceiptRefreshProvider.swift

@@ -9,20 +9,34 @@ import StoreKit
 
 // MARK: - ReceiptRefreshProvider
 
+/// A class that can refresh the bundle's App Store receipt.
 final class ReceiptRefreshProvider: NSObject {
     // MARK: Properties
 
+    /// The dispatch queue factory.
     private let dispatchQueueFactory: IDispatchQueueFactory
+    /// A convenient interface to the contents of the file system, and the primary means of interacting with it.
     private let fileManager: IFileManager
+    /// The type that retrieves the App Store receipt URL.
     private let appStoreReceiptProvider: IAppStoreReceiptProvider
+    /// The receipt refresh request factory.
     private let receiptRefreshRequestFactory: IReceiptRefreshRequestFactory
 
+    /// Collection of handlers for receipt refresh requests.
     private var handlers: [String: ReceiptRefreshHandler] = [:]
 
+    /// Lazy-initialized private dispatch queue for handling tasks related to refreshing receipts.
     private lazy var dispatchQueue: IDispatchQueue = dispatchQueueFactory.privateQueue(label: String(describing: self))
 
     // MARK: Initialization
 
+    /// Creates a new `ReceiptRefreshProvider` instance.
+    ///
+    /// - Parameters:
+    ///   - dispatchQueueFactory: The dispatch queue factory.
+    ///   - fileManager: A convenient interface to the contents of the file system, and the primary means of interacting with it.
+    ///   - appStoreReceiptProvider: The type that retrieves the App Store receipt URL.
+    ///   - receiptRefreshRequestFactory: The receipt refresh request factory.
     init(
         dispatchQueueFactory: IDispatchQueueFactory = DispatchQueueFactory(),
         fileManager: IFileManager = FileManager.default,
@@ -37,6 +51,7 @@ final class ReceiptRefreshProvider: NSObject {
 
     // MARK: Internal
 
+    /// Computed property to retrieve the base64-encoded app store receipt string.
     var receipt: String? {
         if let appStoreReceiptURL = appStoreReceiptProvider.appStoreReceiptURL,
            fileManager.fileExists(atPath: appStoreReceiptURL.path)
@@ -50,10 +65,20 @@ final class ReceiptRefreshProvider: NSObject {
 
     // MARK: Private
 
+    /// Creates a refresh receipt request.
+    ///
+    /// - Parameter id: The request identifier.
+    ///
+    /// - Returns: A receipt refresh request.
     private func makeRequest(id: String) -> IReceiptRefreshRequest {
         receiptRefreshRequestFactory.make(requestID: id, delegate: self)
     }
 
+    /// Fetches receipt information using a refresh request.
+    ///
+    /// - Parameters:
+    ///   - request: The refresh request.
+    ///   - handler: The closure to be executed once the refresh is complete.
     private func fetch(request: IReceiptRefreshRequest, handler: @escaping ReceiptRefreshHandler) {
         dispatchQueue.async {
             self.handlers[request.id] = handler