use_frameworks!
target 'Your target name'

pod 'DYFStoreReceiptVerifier_Swift'
Or
pod 'DYFStoreReceiptVerifier_Swift', '~> 1.1.2'

lazy var receiptVerifier: DYFStoreReceiptVerifier = {
    let verifier = DYFStoreReceiptVerifier()
    verifier.delegate = self
    return verifier
}()

@objc func verifyReceiptDidFinish(_ verifier: DYFStoreReceiptVerifier, didReceiveData data: [String : Any])

@objc func verifyReceipt(_ verifier: DYFStoreReceiptVerifier, didFailWithError error: NSError)

public func verifyReceiptDidFinish(_ verifier: DYFStoreReceiptVerifier, didReceiveData data: [String : Any]) {
    // Writes the implementation codes.
}

public func verifyReceipt(_ verifier: DYFStoreReceiptVerifier, didFailWithError error: NSError) {
    // Writes the implementation codes.
}

// receiptData: the data of the bundle’s App Store receipt. 
let receiptData = DYFStore.receiptURL()
let data = receiptData

self.receiptVerifier.verifyReceipt(data)

self.receiptVerifier.verifyReceipt(data, sharedSecret: "A43512564ACBEF687924646CAFEFBDCAEDF4155125657")

/// Matches the message with the status code.
///
/// - Parameter status: The status code of the request response. More, please see [Receipt Validation Programming Guide](https://developer.apple.com/library/archive/releasenotes/General/ValidateAppStoreReceipt/Chapters/ValidateRemotely.html#//apple_ref/doc/uid/TP40010573-CH104-SW1)
/// - Returns: A tuple that contains status code and the description of status code.
public func matchMessage(withStatus status: Int) -> (Int, String) {
    var message: String = ""
    switch status {
    case 0:
        message = "The receipt as a whole is valid."
        break
    case 21000:
        message = "The App Store could not read the JSON object you provided."
        break
    case 21002:
        message = "The data in the receipt-data property was malformed or missing."
        break
    case 21003:
        message = "The receipt could not be authenticated."
        break
    case 21004:
        message = "The shared secret you provided does not match the shared secret on file for your account."
        break
    case 21005:
        message = "The receipt server is not currently available."
        break
    case 21006:
        message = "This receipt is valid but the subscription has expired. When this status code is returned to your server, the receipt data is also decoded and returned as part of the response. Only returned for iOS 6 style transaction receipts for auto-renewable subscriptions."
        break
    case 21007:
        message = "This receipt is from the test environment, but it was sent to the production environment for verification. Send it to the test environment instead."
        break
    case 21008:
        message = "This receipt is from the production environment, but it was sent to the test environment for verification. Send it to the production environment instead."
        break
    case 21010:
        message = "This receipt could not be authorized. Treat this the same as if a purchase was never made."
        break
    default: /* 21100-21199 */
        message = "Internal data access error."
        break
    }
    return (status, message)
}

/// Matches the message with the status code.
///
/// - Parameter status: The status code of the request response. More, please see [Receipt Validation Programming Guide](https://developer.apple.com/library/archive/releasenotes/General/ValidateAppStoreReceipt/Chapters/ValidateRemotely.html#//apple_ref/doc/uid/TP40010573-CH104-SW1)
/// - Returns: A string that contains the description of status code.
@objc public func matchMessage(withStatus status: Int) -> String {
    let (_, msg) = matchMessage(withStatus: status)
    return msg
}