How do you add an in-app purchase to an iOS application

Question

How do you add an in-app purchase to an iOS app  What are all the details and is there any sample code    This is meant to be a catch-all of sorts for how to add in-app purchases to iOS apps

User · Answer

RMStore is a lightweight iOS library for In-App Purchases. It wraps StoreKit API and provides you with handy blocks for asynchronous requests. Purchasing a product is as easy as calling a single method.

For the advanced users, this library also provides receipt verification, content downloads and transaction persistence.

User · Answer

Just translate Jojodmo code to Swift   class InAppPurchaseManager  NSObject   SKProductsRequestDelegate  SKPaymentTransactionObserver         If you have more than one in-app purchase  you can define both of   of them here  So  for example  you could define both kRemoveAdsProductIdentifier   and kBuyCurrencyProductIdentifier with their respective product ids      for this example  we will only use one product  let kRemoveAdsProductIdentifier    put your product id  the one that we just made in iTunesConnect  in here    IBAction func tapsRemoveAds          NSLog  User requests to remove ads        if SKPaymentQueue canMakePayments             NSLog  User can make payments              If you have more than one in-app purchase  and would like           to have the user purchase a different product  simply define           another function and replace kRemoveAdsProductIdentifier with           the identifier for the other product         let set   Set lt String gt     kRemoveAdsProductIdentifier          let productsRequest   SKProductsRequest productIdentifiers  set          productsRequest delegate   self         productsRequest start              else           NSLog  User cannot make payments due to parental controls             this is called the user cannot make payments  most likely due to parental controls           func purchase product   SKProduct         let payment   SKPayment product  product      SKPaymentQueue defaultQueue   addTransactionObserver self      SKPaymentQueue defaultQueue   addPayment payment     func restore           this is called when the user restores purchases  you should hook this up to a button     SKPaymentQueue defaultQueue   addTransactionObserver self      SKPaymentQueue defaultQueue   restoreCompletedTransactions       func doRemoveAds           TODO  implement                                                                       store delegate                                                                        MARK  - store delegate -   func productsRequest request  SKProductsRequest  didReceiveResponse response  SKProductsResponse         if let validProduct   response products first           NSLog  Products Available            self purchase validProduct            else           NSLog  No products available             this is called if your product id is not valid  this shouldn t be called unless that happens           func paymentQueueRestoreCompletedTransactionsFinished queue  SKPaymentQueue          NSLog  received restored transactions    queue transactions count        for transaction in queue transactions           if transaction transactionState     Restored                 called when the user successfully restores a purchase             NSLog  Transaction state - gt  Restored                  if you have more than one in-app purchase product                you restore the correct product for the identifier                For example  you could use               if productID    kRemoveAdsProductIdentifier                to get the product identifier for the               restored purchases  you can use                              NSString  productID   transaction payment productIdentifier              self doRemoveAds               SKPaymentQueue defaultQueue   finishTransaction transaction              break                      func paymentQueue queue  SKPaymentQueue  updatedTransactions transactions   SKPaymentTransaction          for transaction in transactions           switch transaction transactionState           case  Purchasing  NSLog  Transaction state - gt  Purchasing                 called when the user is in the process of purchasing  do not add any of your own code here          case  Purchased                this is called when the user has successfully purchased the package  Cha-Ching               self doRemoveAds     you can add your code for what you want to happen when the user buys the purchase here  for this tutorial we use removing ads             SKPaymentQueue defaultQueue   finishTransaction transaction              NSLog  Transaction state - gt  Purchased           case  Restored              NSLog  Transaction state - gt  Restored                 add the same code as you did from SKPaymentTransactionStatePurchased here             SKPaymentQueue defaultQueue   finishTransaction transaction          case  Failed                called when the transaction does not finish             if transaction error  code    SKErrorPaymentCancelled                   NSLog  Transaction state - gt  Cancelled                     the user cancelled the payment                              SKPaymentQueue defaultQueue   finishTransaction transaction          case  Deferred                 The transaction is in the queue  but its final status is pending external action              NSLog  Transaction state - gt  Deferred

User · Answer

Swift Users Swift users can check out My Swift Answer for this question Or  check out Yedidya Reiss s Answer  which translates this Objective-C code to Swift  Objective-C Users The rest of this answer is written in Objective-C App Store Connect  Go to appstoreconnect apple com and log in Click My Apps then click the app you want do add the purchase to Click the Features header  and then select In-App Purchases on the left Click the   icon in the middle For this tutorial  we are going to be adding an in-app purchase to remove ads  so choose non-consumable  If you were going to send a physical item to the user  or give them something that they can buy more than once  you would choose consumable  For the reference name  put whatever you want  but make sure you know what it is  For product id put tld websitename appname referencename this will work the best  so for example  you could use com jojodmo blix removeads Choose cleared for sale and then choose price tier as 1  99     Tier 2 would be  1 99  and tier 3 would be  2 99  The full list is available if you click view pricing matrix I recommend you use tier 1  because that s usually the most anyone will ever pay to remove ads  Click the blue add language button  and input the information  This will ALL be shown to the customer  so don t put anything you don t want them seeing For hosting content with Apple choose no You can leave the review notes blank FOR NOW  Skip the screenshot for review FOR NOW  everything we skip we will come back to  Click  save   It could take a few hours for your product ID to register in App Store Connect  so be patient  Setting up your project Now that you ve set up your in-app purchase information on App Store Connect  go into your Xcode project  and go to the application manager  blue page-like icon at the top of where your methods and header files are  click on your app under targets  should be the first one  then go to general  At the bottom  you should see linked frameworks and libraries click the little plus symbol and add the framework StoreKit framework If you don t do this  the in-app purchase will NOT work  If you are using Objective-C as the language for your app  you should skip these five steps  Otherwise  if you are using Swift  you can follow My Swift Answer for this question  here  or  if you prefer to use Objective-C for the In-App Purchase code but are using Swift in your app  you can do the following   Create a new  h  header  file by going to File  gt  New  gt  File     Command     N   This file will be referred to as  quot Your  h file quot  in the rest of the tutorial  When prompted  click Create Bridging Header  This will be our bridging header file  If you are not prompted  go to step 3  If you are prompted  skip step 3 and go directly to step 4   Create another  h file named Bridge h in the main project folder  Then go to the Application Manager  the blue page-like icon   then select your app in the Targets section  and click Build Settings  Find the option that says Swift Compiler - Code Generation  and then set the Objective-C Bridging Header option to Bridge h  In your bridging header file  add the line  import  quot MyObjectiveCHeaderFile h quot   where MyObjectiveCHeaderFile is the name of the header file that you created in step one  So  for example  if you named your header file InAppPurchase h  you would add the line  import  quot InAppPurchase h quot  to your bridge header file   Create a new Objective-C Methods   m  file by going to File  gt  New  gt  File     Command     N   Name it the same as the header file you created in step 1  For example  if you called the file in step 1 InAppPurchase h  you would call this new file InAppPurchase m  This file will be referred to as  quot Your  m file quot  in the rest of the tutorial    Coding Now we re going to get into the actual coding  Add the following code into your  h file  BOOL areAdsRemoved   -  IBAction restore  -  IBAction tapsRemoveAds   Next  you need to import the StoreKit framework into your  m file  as well as add SKProductsRequestDelegate and SKPaymentTransactionObserver after your  interface declaration   import  lt StoreKit StoreKit h gt     put the name of your view controller in place of MyViewController  interface MyViewController    lt SKProductsRequestDelegate  SKPaymentTransactionObserver gt    end   implementation MyViewController   the name of your view controller  same as above      the code below will be added here  end  and now add the following into your  m file  this part gets complicated  so I suggest that you read the comments in the code    If you have more than one in-app purchase  you can define both of   of them here  So  for example  you could define both kRemoveAdsProductIdentifier   and kBuyCurrencyProductIdentifier with their respective product ids      for this example  we will only use one product   define kRemoveAdsProductIdentifier   quot put your product id  the one that we just made in App Store Connect  in here quot   -  IBAction tapsRemoveAds      NSLog   quot User requests to remove ads quot         if  SKPaymentQueue canMakePayments            NSLog   quot User can make payments quot                   If you have more than one in-app purchase  and would like           to have the user purchase a different product  simply define            another function and replace kRemoveAdsProductIdentifier with            the identifier for the other product          SKProductsRequest  productsRequest     SKProductsRequest alloc  initWithProductIdentifiers  NSSet setWithObject kRemoveAdsProductIdentifier            productsRequest delegate   self           productsRequest start                  else          NSLog   quot User cannot make payments due to parental controls quot              this is called the user cannot make payments  most likely due to parental controls          -  void productsRequest  SKProductsRequest   request didReceiveResponse  SKProductsResponse   response      SKProduct  validProduct   nil      int count    response products count       if count  gt  0           validProduct    response products objectAtIndex 0           NSLog   quot Products Available  quot             self purchase validProduct             else if  validProduct           NSLog   quot No products available quot              this is called if your product id is not valid  this shouldn t be called unless that happens           -  void purchase  SKProduct   product      SKPayment  payment    SKPayment paymentWithProduct product          SKPaymentQueue defaultQueue  addTransactionObserver self         SKPaymentQueue defaultQueue  addPayment payment      -  IBAction  restore        this is called when the user restores purchases  you should hook this up to a button       SKPaymentQueue defaultQueue  addTransactionObserver self         SKPaymentQueue defaultQueue  restoreCompletedTransactions      -  void  paymentQueueRestoreCompletedTransactionsFinished  SKPaymentQueue   queue       NSLog   quot received restored transactions   i quot   queue transactions count       for SKPaymentTransaction  transaction in queue transactions           if transaction transactionState    SKPaymentTransactionStateRestored                 called when the user successfully restores a purchase             NSLog   quot Transaction state - gt  Restored quot                   if you have more than one in-app purchase product                you restore the correct product for the identifier                For example  you could use               if productID    kRemoveAdsProductIdentifier                to get the product identifier for the               restored purchases  you can use                              NSString  productID   transaction payment productIdentifier               self doRemoveAds                 SKPaymentQueue defaultQueue  finishTransaction transaction               break                        -  void paymentQueue  SKPaymentQueue   queue updatedTransactions  NSArray   transactions      for SKPaymentTransaction  transaction in transactions             if you have multiple in app purchases in your app            you can get the product identifier of this transaction           by using transaction payment productIdentifier                      then  check the identifier against the product IDs           that you have defined to check which product the user           just purchased                      switch transaction transactionState               case SKPaymentTransactionStatePurchasing  NSLog   quot Transaction state - gt  Purchasing quot                      called when the user is in the process of purchasing  do not add any of your own code here                  break              case SKPaymentTransactionStatePurchased                this is called when the user has successfully purchased the package  Cha-Ching                    self doRemoveAds     you can add your code for what you want to happen when the user buys the purchase here  for this tutorial we use removing ads                   SKPaymentQueue defaultQueue  finishTransaction transaction                   NSLog   quot Transaction state - gt  Purchased quot                    break              case SKPaymentTransactionStateRestored                  NSLog   quot Transaction state - gt  Restored quot                      add the same code as you did from SKPaymentTransactionStatePurchased here                   SKPaymentQueue defaultQueue  finishTransaction transaction                   break              case SKPaymentTransactionStateFailed                    called when the transaction does not finish                 if transaction error code    SKErrorPaymentCancelled                       NSLog   quot Transaction state - gt  Cancelled quot                          the user cancelled the payment                                        SKPaymentQueue defaultQueue  finishTransaction transaction                   break                     Now you want to add your code for what will happen when  the user finishes the transaction  for this tutorial  we use removing adds  you will have to add your own code for what happens when the banner view loads  -  void doRemoveAds      ADBannerView  banner       banner setAlpha 0       areAdsRemoved   YES      removeAdsButton hidden   YES      removeAdsButton enabled   NO        NSUserDefaults standardUserDefaults  setBool areAdsRemoved forKey   quot areAdsRemoved quot          use NSUserDefaults so that you can load whether or not they bought it       it would be better to use KeyChain access  or something more secure       to store the user data  because NSUserDefaults can be changed        You re average downloader won t be able to change it very easily  but       it s still best to use something more secure than NSUserDefaults        For the purpose of this tutorial  though  we re going to use NSUserDefaults       NSUserDefaults standardUserDefaults  synchronize      If you don t have ads in your application  you can use any other thing that you want  For example  we could make the color of the background blue  To do this we would want to use  -  void doRemoveAds       self view setBackgroundColor  UIColor blueColor        areAdsRemoved   YES       set the bool for whether or not they purchased it to YES  you could use your own boolean here  but you would have to declare it in your  h file        NSUserDefaults standardUserDefaults  setBool areAdsRemoved forKey   quot areAdsRemoved quot          use NSUserDefaults so that you can load wether or not they bought it       NSUserDefaults standardUserDefaults  synchronize      Now  somewhere in your viewDidLoad method  you re going to want to add the following code  areAdsRemoved     NSUserDefaults standardUserDefaults  boolForKey   quot areAdsRemoved quot      NSUserDefaults standardUserDefaults  synchronize     this will load wether or not they bought the in-app purchase  if areAdsRemoved        self view setBackgroundColor  UIColor blueColor          if they did buy it  set the background to blue  if your using the code above to set the background to blue  if your removing ads  your going to have to make your own code here    Now that you have added all the code  go into your  xib or storyboard file  and add two buttons  one saying purchase  and the other saying restore  Hook up the tapsRemoveAds IBAction to the purchase button that you just made  and the restore IBAction to the restore button  The restore action will check if the user has previously purchased the in-app purchase  and give them the in-app purchase for free if they do not already have it  Submitting for review Next  go into App Store Connect  and click Users and Access then click the Sandbox Testers header  and then click the   symbol on the left where it says Testers  You can just put in random things for the first and last name  and the e-mail does not have to be real - you just have to be able to remember it  Put in a password  which you will have to remember  and fill in the rest of the info  I would recommend that you make the Date of Birth a date that would make the user 18 or older  App Store Territory HAS to be in the correct country  Next  log out of your existing iTunes account  you can log back in after this tutorial   Now  run your application on your iOS device  if you try running it on the simulator  the purchase will always error  you HAVE TO run it on your iOS device  Once the app is running  tap the purchase button  When you are prompted to log into your iTunes account  log in as the test user that we just created  Next when it asks you to confirm the purchase of 99   or whatever you set the price tier too  TAKE A SCREEN SNAPSHOT OF IT this is what your going to use for your screenshot for review on App Store Connect  Now cancel the payment  Now  go to App Store Connect  then go to My Apps  gt  the app you have the In-app purchase on  gt  In-App Purchases  Then click your in-app purchase and click edit under the in-app purchase details  Once you ve done that  import the photo that you just took on your iPhone into your computer  and upload that as the screenshot for review  then  in review notes  put your TEST USER e-mail and password  This will help apple in the review process  After you have done this  go back onto the application on your iOS device  still logged in as the test user account  and click the purchase button  This time  confirm the payment Don t worry  this will NOT charge your account ANY money  test user accounts get all in-app purchases for free After you have confirmed the payment  make sure that what happens when the user buys your product actually happens  If it doesn t  then thats going to be an error with your doRemoveAds method  Again  I recommend using changing the background to blue for testing the in-app purchase  this should not be your actual in-app purchase though  If everything works and you re good to go  Just make sure to include the in-app purchase in your new binary when you upload it to App Store Connect   Here are some common errors  Logged  No Products Available This could mean four things   You didn t put the correct in-app purchase ID in your code  for the identifier kRemoveAdsProductIdentifier in the above code You didn t clear your in-app purchase for sale on App Store Connect You didn t wait for the in-app purchase ID to be registered in App Store Connect  Wait a couple hours from creating the ID  and your problem should be resolved  You didn t complete filling your Agreements  Tax  and Banking info    If it doesn t work the first time  don t get frustrated  Don t give up  It took me about 5 hours straight before I could get this working  and about 10 hours searching for the right code  If you use the code above exactly  it should work fine  Feel free to comment if you have any questions at all  I hope this helps to all of those hoping to add an in-app purchase to their iOS application  Cheers

User · Answer

I know I am quite late to post this  but I share similar experience when I learned the ropes of IAP model   In-app purchase is one of the most comprehensive workflow in iOS implemented by Storekit framework  The entire documentation is quite clear if you patience to read it  but is somewhat advanced in nature of technicality   To summarize   1 - Request the products - use SKProductRequest  amp  SKProductRequestDelegate classes to issue request for Product IDs and receive them back from your own itunesconnect store   These SKProducts should be used to populate your store UI which the user can use to buy a specific product   2 - Issue payment request - use SKPayment  amp  SKPaymentQueue to add payment to the transaction queue   3 - Monitor transaction queue for status update - use SKPaymentTransactionObserver Protocol s updatedTransactions method to monitor status   SKPaymentTransactionStatePurchasing - don t do anything SKPaymentTransactionStatePurchased - unlock product  finish the transaction SKPaymentTransactionStateFailed - show error  finish the transaction SKPaymentTransactionStateRestored - unlock product  finish the transaction   4 - Restore button flow - use SKPaymentQueue s restoreCompletedTransactions to accomplish this - step 3 will take care of the rest  along with SKPaymentTransactionObserver s following methods   paymentQueueRestoreCompletedTransactionsFinished restoreCompletedTransactionsFailedWithError   Here is a step by step tutorial  authored by me as a result of my own attempts to understand it  that explains it  At the end it also provides code sample that you can directly use   Here is another one I created to explain certain things that only text could describe in better manner

User · Answer

Swift Answer  This is meant to supplement my Objective-C answer for Swift users  to keep the Objective-C answer from getting too big   Setup  First  set up the in-app purchase on appstoreconnect apple com  Follow the beginning part of my Objective-C answer  steps 1-13  under the App Store Connect header  for instructions on doing that   It could take a few hours for your product ID to register in App Store Connect  so be patient   Now that you ve set up your in-app purchase information on App Store Connect  we need to add Apple s framework for in-app-purchases  StoreKit  to the app    Go into your Xcode project  and go to the application manager  blue page-like icon at the top of the left bar where your app s files are   Click on your app under targets on the left  it should be the first option   then go to  Capabilities  at the top  On the list  you should see an option  In-App Purchase   Turn this capability ON  and Xcode will add StoreKit to your project   Coding  Now  we re going to start coding   First  make a new swift file that will manage all of your in-app-purchases  I m going to call it IAPManager swift    In this file  we re going to create a new class  called IAPManager that is a SKProductsRequestDelegate and SKPaymentTransactionObserver  At the top  make sure you import Foundation and StoreKit    import Foundation import StoreKit  public class IAPManager  NSObject  SKProductsRequestDelegate                           SKPaymentTransactionObserver       Next  we re going to add a variable to define the identifier for our in-app purchase  you could also use an enum  which would be easier to maintain if you have multiple IAPs       This should the ID of the in-app-purchase you made on AppStore Connect     if you have multiple IAPs  you ll need to store their identifiers in    other variables  too  or  preferably in an enum   let removeAdsID    com skiplit removeAds    Let s add an initializer for our class next      This is the initializer for your IAPManager class       A better  and more scaleable way of doing this    is to also accept a callback in the initializer  and call    that callback in places like the paymentQueue function  and    in all functions in this class  in place of calls to functions    in RemoveAdsManager  you ll see those calls in the code below    let productID  String init productID  String       self productID   productID     Now  we re going to add the required functions for SKProductsRequestDelegate and SKPaymentTransactionObserver to work   We ll add the RemoveAdsManager class later     This is called when a SKProductsRequest receives a response public func productsRequest   request  SKProductsRequest  didReceive response  SKProductsResponse          Let s try to get the first product from the response        to the request     if let product   response products first             We were able to get the product  Make a new payment            using this product         let payment   SKPayment product  product              add the new payment to the queue         SKPaymentQueue default   add self          SKPaymentQueue default   add payment            else             Something went wrong  It is likely that either            the user doesn t have internet connection  or            your product ID is wrong                        Tell the user in requestFailed   by sending an alert             or something of the sort          RemoveAdsManager removeAdsFailure               This is called when the user restores their IAP sucessfully private func paymentQueueRestoreCompletedTransactionsFinished   queue  SKPaymentQueue          For every transaction in the transaction queue        for transaction in queue transactions             If that transaction was restored         if transaction transactionState     restored                 get the producted ID from the transaction             let productID   transaction payment productIdentifier                 In this case  we have only one IAP  so we don t need to check                what IAP it is  However  this is useful if you have multiple IAPs                 You ll need to figure out which one was restored             if productID lowercased      IAPManager removeAdsID lowercased                        Restore the user s purchases                 RemoveAdsManager restoreRemoveAdsSuccess                                 finish the payment             SKPaymentQueue default   finishTransaction transaction                        This is called when the state of the IAP changes -- from purchasing to purchased  for example     This is where the magic happens    public func paymentQueue   queue  SKPaymentQueue  updatedTransactions transactions   SKPaymentTransaction        for transaction in transactions             get the producted ID from the transaction         let productID   transaction payment productIdentifier             In this case  we have only one IAP  so we don t need to check            what IAP it is             However  if you have multiple IAPs  you ll need to use productID            to check what functions you should run here           switch transaction transactionState          case  purchasing                 if the user is currently purchasing the IAP                 we don t need to do anything                                You could use this to show the user                an activity indicator  or something like that             break         case  purchased                 the user successfully purchased the IAP              RemoveAdsManager removeAdsSuccess               SKPaymentQueue default   finishTransaction transaction          case  restored                     the user restored their IAP                  IAPTestingHandler restoreRemoveAdsSuccess                   SKPaymentQueue default   finishTransaction transaction          case  failed                     The transaction failed                  RemoveAdsManager removeAdsFailure                      finish the transaction                 SKPaymentQueue default   finishTransaction transaction          case  deferred                     This happens when the IAP needs an external action                    in order to proceeded  like Ask to Buy                 RemoveAdsManager removeAdsDeferred                   break                     Now let s add some functions that can be used to start a purchase or a restore purchases      Call this when you want to begin a purchase    for the productID you gave to the initializer public func beginPurchase           If the user can make payments     if SKPaymentQueue canMakePayments               Create a new request         let request   SKProductsRequest productIdentifiers   productID              Set the request delegate to self  so we receive a response         request delegate   self            start the request         request start             else             Otherwise  tell the user that            they are not authorized to make payments             due to parental controls  etc             Call this when you want to restore all purchases    regardless of the productID you gave to the initializer public func beginRestorePurchases           restore purchases  and give responses to self     SKPaymentQueue default   add self      SKPaymentQueue default   restoreCompletedTransactions       Next  let s add a new utilities class to manage our IAPs  All of this code could be in one class  but having it multiple makes it a little cleaner  I m going to make a new class called RemoveAdsManager  and in it  put a few functions  public class RemoveAdsManager       class func removeAds       class func restoreRemoveAds        class func areAdsRemoved   -  Bool      class func removeAdsSuccess       class func restoreRemoveAdsSuccess       class func removeAdsDeferred       class func removeAdsFailure       The first three functions  removeAds  restoreRemoveAds  and areAdsRemoved  are functions that you ll call to do certain actions  The last four are one that will be called by IAPManager   Let s add some code to the first two functions  removeAds and restoreRemoveAds      Call this when the user wants    to remove ads  like when they    press a  remove ads  button class func removeAds           Before starting the purchase  you could tell the        user that their purchase is happening  maybe with        an activity indicator      let iap   IAPManager productID  IAPManager removeAdsID      iap beginPurchase         Call this when the user wants    to restore their IAP purchases     like when they press a  restore    purchases  button  class func restoreRemoveAds           Before starting the purchase  you could tell the        user that the restore action is happening  maybe with        an activity indicator      let iap   IAPManager productID  IAPManager removeAdsID      iap beginRestorePurchases       And lastly  let s add some code to the last five functions      Call this to check whether or not    ads are removed  You can use the    result of this to hide or show    ads class func areAdsRemoved   - gt  Bool         This is the code that is run to check        if the user has the IAP       return UserDefaults standard bool forKey   RemoveAdsPurchased         This will be called by IAPManager    when the user sucessfully purchases    the IAP class func removeAdsSuccess           This is the code that is run to actually        give the IAP to the user                I m using UserDefaults in this example         but you may want to use Keychain         or some other method  as UserDefaults        can be modified by users using their        computer  if they know how to  more        easily than Keychain      UserDefaults standard set true  forKey   RemoveAdsPurchased       UserDefaults standard synchronize         This will be called by IAPManager    when the user sucessfully restores     their purchases class func restoreRemoveAdsSuccess           Give the user their IAP back  Likely all you ll need to        do is call the same function you call when a user        sucessfully completes their purchase  In this case  removeAdsSuccess        removeAdsSuccess         This will be called by IAPManager    when the IAP failed class func removeAdsFailure           Send the user a message explaining that the IAP        failed for some reason  and to try again later       This will be called by IAPManager    when the IAP gets deferred  class func removeAdsDeferred           Send the user a message explaining that the IAP        was deferred  and pending an external action  like        Ask to Buy      Putting it all together  we get something like this   import Foundation import StoreKit  public class RemoveAdsManager          Call this when the user wants        to remove ads  like when they        press a  remove ads  button     class func removeAds               Before starting the purchase  you could tell the            user that their purchase is happening  maybe with            an activity indicator          let iap   IAPManager productID  IAPManager removeAdsID          iap beginPurchase                 Call this when the user wants        to restore their IAP purchases         like when they press a  restore        purchases  button      class func restoreRemoveAds               Before starting the purchase  you could tell the            user that the restore action is happening  maybe with            an activity indicator          let iap   IAPManager productID  IAPManager removeAdsID          iap beginRestorePurchases                 Call this to check whether or not        ads are removed  You can use the        result of this to hide or show        ads     class func areAdsRemoved   -  Bool             This is the code that is run to check            if the user has the IAP           return UserDefaults standard bool forKey   RemoveAdsPurchased                 This will be called by IAPManager        when the user sucessfully purchases        the IAP     class func removeAdsSuccess               This is the code that is run to actually            give the IAP to the user                        I m using UserDefaults in this example             but you may want to use Keychain             or some other method  as UserDefaults            can be modified by users using their            computer  if they know how to  more            easily than Keychain          UserDefaults standard set true  forKey   RemoveAdsPurchased           UserDefaults standard synchronize                 This will be called by IAPManager        when the user sucessfully restores         their purchases     class func restoreRemoveAdsSuccess               Give the user their IAP back  Likely all you ll need to            do is call the same function you call when a user            sucessfully completes their purchase  In this case  removeAdsSuccess           removeAdsSuccess                 This will be called by IAPManager        when the IAP failed     class func removeAdsFailure               Send the user a message explaining that the IAP            failed for some reason  and to try again later               This will be called by IAPManager        when the IAP gets deferred      class func removeAdsDeferred               Send the user a message explaining that the IAP            was deferred  and pending an external action  like            Ask to Buy            public class IAPManager  NSObject  SKProductsRequestDelegate  SKPaymentTransactionObserver          This should the ID of the in-app-purchase you made on AppStore Connect         if you have multiple IAPs  you ll need to store their identifiers in        other variables  too  or  preferably in an enum       static let removeAdsID    com skiplit removeAds          This is the initializer for your IAPManager class               An alternative  and more scaleable way of doing this        is to also accept a callback in the initializer  and call        that callback in places like the paymentQueue function  and        in all functions in this class  in place of calls to functions        in RemoveAdsManager      let productID  String     init productID  String           self productID   productID               Call this when you want to begin a purchase        for the productID you gave to the initializer     public func beginPurchase               If the user can make payments         if SKPaymentQueue canMakePayments                   Create a new request             let request   SKProductsRequest productIdentifiers   productID               request delegate   self             request start                     else                 Otherwise  tell the user that                they are not authorized to make payments                 due to parental controls  etc                         Call this when you want to restore all purchases        regardless of the productID you gave to the initializer     public func beginRestorePurchases            SKPaymentQueue default   add self          SKPaymentQueue default   restoreCompletedTransactions                 This is called when a SKProductsRequest receives a response     public func productsRequest   request  SKProductsRequest  didReceive response  SKProductsResponse              Let s try to get the first product from the response            to the request         if let product   response products first                 We were able to get the product  Make a new payment                using this product             let payment   SKPayment product  product                  add the new payment to the queue             SKPaymentQueue default   add self              SKPaymentQueue default   add payment                    else                 Something went wrong  It is likely that either                the user doesn t have internet connection  or                your product ID is wrong                                Tell the user in requestFailed   by sending an alert                 or something of the sort              RemoveAdsManager removeAdsFailure                           This is called when the user restores their IAP sucessfully     private func paymentQueueRestoreCompletedTransactionsFinished   queue  SKPaymentQueue              For every transaction in the transaction queue            for transaction in queue transactions                 If that transaction was restored             if transaction transactionState     restored                     get the producted ID from the transaction                 let productID   transaction payment productIdentifier                     In this case  we have only one IAP  so we don t need to check                    what IAP it is  However  this is useful if you have multiple IAPs                     You ll need to figure out which one was restored                 if productID lowercased      IAPManager removeAdsID lowercased                            Restore the user s purchases                     RemoveAdsManager restoreRemoveAdsSuccess                                         finish the payment                 SKPaymentQueue default   finishTransaction transaction                                        This is called when the state of the IAP changes -- from purchasing to purchased  for example         This is where the magic happens        public func paymentQueue   queue  SKPaymentQueue  updatedTransactions transactions   SKPaymentTransaction            for transaction in transactions                 get the producted ID from the transaction             let productID   transaction payment productIdentifier                 In this case  we have only one IAP  so we don t need to check                what IAP it is                 However  if you have multiple IAPs  you ll need to use productID                to check what functions you should run here               switch transaction transactionState              case  purchasing                     if the user is currently purchasing the IAP                     we don t need to do anything                                        You could use this to show the user                    an activity indicator  or something like that                 break             case  purchased                     the user sucessfully purchased the IAP                  RemoveAdsManager removeAdsSuccess                   SKPaymentQueue default   finishTransaction transaction              case  restored                     the user restored their IAP                  RemoveAdsManager restoreRemoveAdsSuccess                   SKPaymentQueue default   finishTransaction transaction              case  failed                     The transaction failed                  RemoveAdsManager removeAdsFailure                      finish the transaction                 SKPaymentQueue default   finishTransaction transaction              case  deferred                     This happens when the IAP needs an external action                    in order to proceeded  like Ask to Buy                 RemoveAdsManager removeAdsDeferred                   break                                    Lastly  you need to add some way for the user to start the purchase and call RemoveAdsManager removeAds   and start a restore and call RemoveAdsManager restoreRemoveAds    like a button somewhere  Keep in mind that  per the App Store guidelines  you do need to provide a button to restore purchases somewhere   Submitting for review  The last thing to do is submit your IAP for review on App Store Connect  For detailed instructions on doing that  you can follow the last part of my Objective-C answer  under the Submitting for review header

[ios] How do you add an in-app purchase to an iOS application?

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