In-App Subscription Receipt Validation in iOS using swift.

I have already shared a blog where I implemented In-App Subscription in iOS. If you have not read yet then click here.

In this blog, I am going to show how we validate the Subscription? I will start with Step 11 from the previous blog.

Step 1: Call the receiptValidation() Method from the updatedTransactions. Note that only receiptValidation() call only when Transaction State is purchased.

extension IPAService:SKPaymentTransactionObserver{

func paymentQueue(_ queue: SKPaymentQueue, updatedTransactions transactions: [SKPaymentTransaction]) {

for transaction in transactions{

print(transaction.transactionState.status(), transaction.payment.productIdentifier)

switch transaction.transactionState {

case .purchasing: break;

case .purchased:

self.receiptValidation()

queue.finishTransaction(transaction)

case .restored:

queue.finishTransaction(transaction)

default:

queue.finishTransaction(transaction)

}

Step 2: Now handle the receiptValidation() method.

func receiptValidation() {
        let verifyReceiptURL = "https://sandbox.itunes.apple.com/verifyReceipt"
        let receiptFileURL = Bundle.main.appStoreReceiptURL
        let receiptData = try? Data(contentsOf: receiptFileURL!)
        let recieptString = receiptData?.base64EncodedString(options: NSData.Base64EncodingOptions(rawValue: 0))
        let jsonDict: [String: AnyObject] = ["receipt-data" : recieptString! as AnyObject, "password" : "password" as AnyObject]
        
        do {
            let requestData = try JSONSerialization.data(withJSONObject: jsonDict, options: JSONSerialization.WritingOptions.prettyPrinted)
            let storeURL = URL(string: verifyReceiptURL)!
            var storeRequest = URLRequest(url: storeURL)
            storeRequest.httpMethod = "POST"
            storeRequest.httpBody = requestData
            let session = URLSession(configuration: URLSessionConfiguration.default)
            let task = session.dataTask(with: storeRequest, completionHandler: { [weak self] (data, response, error) in
                
                do {
                    if let jsonResponse = try JSONSerialization.jsonObject(with: data!, options: JSONSerialization.ReadingOptions.mutableContainers) as? NSDictionary{
                    print("Response :",jsonResponse)
                    if let date = self?.getExpirationDateFromResponse(jsonResponse) {
                        print(date)
                    }
                    }
                } catch let parseError {
                    print(parseError)
                }
            })
            task.resume()
        } catch let parseError {
            print(parseError)
        }
    }

func receiptValidation() {

let verifyReceiptURL = "https://sandbox.itunes.apple.com/verifyReceipt"

let receiptFileURL = Bundle.main.appStoreReceiptURL

let receiptData = try? Data(contentsOf: receiptFileURL!)

let recieptString = receiptData?.base64EncodedString(options: NSData.Base64EncodingOptions(rawValue: 0))

let jsonDict: [String: AnyObject] = ["receipt-data" : recieptString! as AnyObject, "password" : "password" as AnyObject]

do {

let requestData = try JSONSerialization.data(withJSONObject: jsonDict, options: JSONSerialization.WritingOptions.prettyPrinted)

let storeURL = URL(string: verifyReceiptURL)!

var storeRequest = URLRequest(url: storeURL)

storeRequest.httpMethod = "POST"

storeRequest.httpBody = requestData

let session = URLSession(configuration: URLSessionConfiguration.default)

let task = session.dataTask(with: storeRequest, completionHandler: { [weak self] (data, response, error) in

do {

if let jsonResponse = try JSONSerialization.jsonObject(with: data!, options: JSONSerialization.ReadingOptions.mutableContainers) as? NSDictionary{

print("Response :",jsonResponse)

if let date = self?.getExpirationDateFromResponse(jsonResponse) {

print(date)

}

} catch let parseError {

print(parseError)

}

})

task.resume()

} catch let parseError {

print(parseError)

}

There is two verifyReceiptURL for gathering the information from iTunes for both sandbox and live.

SandBox: "https://sandbox.itunes.apple.com/verifyReceipt"

Live : "https://buy.itunes.apple.com/verifyReceipt"

The verifyReceiptURL API having 2 params. One is receipt-data which content local receipt stored data and the second one is the password where you have to pass Shared Secret.

Step 3: Now get the expire date from the response data.

Call the getExpirationDateFromResponse() after the data received from the API.

func getExpirationDateFromResponse(_ jsonResponse: NSDictionary) -> Date? {

if let receiptInfo: NSArray = jsonResponse["latest_receipt_info"] as? NSArray {

let lastReceipt = receiptInfo.lastObject as! NSDictionary

let formatter = DateFormatter()

formatter.dateFormat = "yyyy-MM-dd HH:mm:ss VV"

if let expiresDate = lastReceipt["expires_date"] as? String {

return formatter.date(from: expiresDate)

}

return nil

}

else {

return nil

}

Conclusion

So please follow the above steps to validate the subscription and And if you have any issue or suggestion you can leave your message in the comment section I will try to solve this.

Debabrata Roy

24 Dec, 2019
Created by - Debabrata Roy

. . .

7 comments

Mark 4 years ago

I get error “Cannot find ‘self’ in scope from line 15 in recieptValidation. Not sure how to fix this?

Mark 4 years ago
Omitting the [weak self] avoids the syntax issue, but the result of this script results in status = 21002 which means “The data in the receipt-data property was malformed or missing.” I have found lots of scripts like this one that always end up having this result. Also, it seems that many others have similar issues. Any ideas what is the cause?

Reply
- Debabrata Roy (Moderator) 4 years ago
  We can try with different encoding option.
  Please try with .endLineWithCarriageReturn option, just replace
  let recieptString = receiptData?.base64EncodedString(options: NSData.Base64EncodingOptions(rawValue: 0))
  
  To
  
  let recieptString = receiptData?.base64EncodedString(options: .endLineWithCarriageReturn)
  
  Thanks
  
  Reply
  - Mark 3 years ago
    Thanks for responding. I should have mentioned I was working in xCode. When I use the code in the sandbox going through appstoreConnect your code seems to work well. Except I have found that the date func getExpirationDateFromResponse does not acquire the most recent expire date. Instead, the expire date seems to be a random selection. Do you know if an improvement in the query can be made to get the correct expire date? Its the one at the top in all the receipts I’ve seen. Thanks again for your help
    
    Reply
    - Debabrata Roy (Moderator) 3 years ago
      Please check Apple doc for more all details.https://developer.apple.com/library/archive/releasenotes/General/ValidateAppStoreReceipt/Chapters/ReceiptFields.html#//apple_ref/doc/uid/TP40010573-CH106-SW12
      
      Reply

brijesh Ajudia 2 years ago

When I am doing with Live URL then it responds to me with “21007”. Can you please tell me what should I do next?

Debabrata Roy (Moderator) 2 years ago
When your app processes the receipt, it must be capable of detecting the 21007 receipt status code and sending the receipt to the sandbox receipt validation server (https://sandbox.itunes.apple.com/verifyReceipt).

Reply

In-App Subscription Receipt Validation in iOS using swift.

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