在AppStore、Google Play和Amazon Store中，应用程序可以应用多个IAP（应用内购买）。 以下是在iOS中获取应用程序中已应用IAP数量的示例代码：

Swift语言：

let receiptURL = Bundle.main.appStoreReceiptURL
let receiptData = try? Data(contentsOf: receiptURL!)
let receiptString = receiptData?.base64EncodedString(options: [])
let receiptBody = ["receipt-data" : receiptString!, "password" : "your_shared_secret_password"]
let receiptURLIOS = URL(string: "https://buy.itunes.apple.com/verifyReceipt")
var request = URLRequest(url: receiptURLIOS!)
request.httpMethod = "POST"
request.addValue("application/json", forHTTPHeaderField: "Content-Type")
request.httpBody = try? JSONSerialization.data(withJSONObject: receiptBody, options: [])

let task = URLSession.shared.dataTask(with: request) { data, response, error in
    guard let data = data, error == nil else {
        print(error?.localizedDescription ?? "No data")
        return
    }

    let responseJSON = try? JSONSerialization.jsonObject(with: data, options: [])
    if let responseDictionary = responseJSON as? [String: Any],
        let receipt = responseDictionary["receipt"] as? [String: Any],
        let inAppPurchases = receipt["in_app"] as? [[String: Any]] {
        let numberOfPurchases = inAppPurchases.count
        print("Number of In-App Purchases: \(numberOfPurchases)")
    }
}
task.resume()

在安卓中，可以使用Google Play的API来获取应用程序中已应用IAP数量。以下是一个示例代码：

Java语言：

//设置API凭据 GoogleCredential credential = GoogleCredential.fromStream(new FileInputStream("path/to/key_file.json")) .createScoped(Collections.singleton(AndroidPublisherScopes.ANDROIDPUBLISHER));

//创建AndroidPublisher对象 AndroidPublisher publisher = new AndroidPublisher.Builder(GoogleNetHttpTransport.newTrustedTransport(),