I've set up AdMob ads on my app and want to set up In-App Purchases so that people can pay to disable the ads if they want to. I looked around for some guides on how to do it but they are all for Consumables, none for Non-Consumables. Even the example code that comes with the in_app_purchase Flutter package is only about Consumables.
Can someone give me some guidance on how to set up the minimal code just to disable ads in Flutter? I managed to set it up a couple of years back in React Native for consumables and even with guides I remember it was a bit of a nightmare.
I have the In-App Purchase set up in Appstoreconnect already, I just want to know what the actual code needed is. I'm assuming that with just disabling ads the code would be shorter than with consumables.
In the in_app_purchase readme it gives this:
final ProductDetails productDetails = ... // Saved earlier from queryPastPurchases().
final PurchaseParam purchaseParam = PurchaseParam(productDetails: productDetails);
if (_isConsumable(productDetails)) {
InAppPurchaseConnection.instance.buyConsumable(purchaseParam: purchaseParam);
} else {
InAppPurchaseConnection.instance.buyNonConsumable(purchaseParam: purchaseParam);
}
Related
Some app which includes personal info often requires login function,
but I want to minimize it into pin code only.
I googled all over the place, but I am a bit confused because in many cases
pin auth means what requires SMS authentication or NATIVE_APP PIN authentication.
I just want my app to ask 4~6 simple pin codes, instead of full login function.
But I don't know which flutter package I should use...
And one more, should I use the local storage or the firebase?
If you have no time, a link or short notice will also be truly appreciated.
Thank you for reading.
I googled 'pin auth', 'pin code', etc. for several days...
But all of them are either too out-dated or not for my case.
There's a possibility that I don't know the keywords to search, since I am a newbie here.
Help me out with your ideas please...
One option is to use local_auth. It includes authentication with biometrics too.
try {
final bool didAuthenticate = await auth.authenticate(
localizedReason: 'Please authenticate');
// ยทยทยท
} on PlatformException {
// ...
}
I am using revenucat to manage subscriptions in my app. But I noticed a problem. I have promo codes that I created on google play for my user. With this code, the user can use 3 months free of charge. When the user logs in on another device, I can't get the information that the user is in the trial period. Therefore, the purchase screen appears again. how can i solve this. I understand from the code below that the user is a premium member.
Future updatePurchaseStatus() async {
final purchaserInfo = await Purchases.getCustomerInfo();
final entitlements = purchaserInfo.entitlements.active.values.toList();
_entitlement =
entitlements.isEmpty ? Entitlement.free : Entitlement.premium;
if (entitlements.isNotEmpty) {
_entitlementInfo = purchaserInfo.entitlements.active.values.last;
}
notifyListeners();
}
I am testing how my Flutter app handles notification using my Samsung Android 12 phone and Firebase Messaging campaign.
I have gotten this code (simplified) to work for a month and notification is handled properly.
FirebaseMessaging.instance.getInitialMessage().then((message) {
if (message != null) {
String? routeName = message.data["route"];
if (routeName != null) {
Navigator.of(context).pushNamed(routeName);
}
}
});
However, today when I wanted to change how handling notification works, I found out that the changes I made to this code are not reflected in the app when debugging through Flutter. Opening the app from a terminated state through the notification still behaves according to the old code above.
I have tried many things:
Uninstalling the app on Android
Removing all code related to Firebase Messaging
Clearing all app cache and data
But the app still keeps the behavior of the old code. Is there anything I can do to reset the behavior of FirebaseMessaging.instance.getInitialMessage() ?
My app has a 1 month autorenewal subscription. When the user clicks on a "Buy a subscription" button I am saving date of purchase to shared preferences.
Then, after 1 month, I need to check is this subscription is still valid.
So how can I implement it?
==== UPDATE from 11.03.2020
Hi, I can see this post still reading by people who looking for a method of how to work with subscription in Flutter.
During 2019 I made two apps with thousands installs where users can buy a renewable subscription on the 2 platforms.
Until February 2020 I used for this package from Flutter team https://pub.dev/packages/in_app_purchase, BUT - there is no way to get info about the user to unsubscribe in iOS. This is not the plugin issue, but the iOS approach for the process. We should implement our own backend for security reasons (by the way Google also recommends to do the same, but still left the way to check state directly from the app).
So, after some researches, I found guys who made backend and plugin and it is free until you have less than 10 000 USD revenue for the month.
https://www.revenuecat.com/
https://pub.dev/packages/purchases_flutter
I've implemented this plugin in my apps and it works like a charm. There is some good approaches that allow you to get a subscription state at any point in the app. I'm going to make an example and article, but not sure about the timing.
====
UPDATE from 15.07.2019. Just to save time. The answer below was given for an outdated plugin for payments. After that Flutter team made plugin
https://pub.dev/packages/in_app_purchase
and I recommend using it.
=====
The best way is to use a secure backend server for receiving Real-time Developer Notifications.
But, it is possible to check status directly in the application.
So, when user tries to get access to some paid functionality you can check whether his subscription is active or not. Below is the example:
Create somewhere the file with the class
import 'dart:io' show Platform;
import 'package:flutter/services.dart';
import 'package:flutter_inapp_purchase/flutter_inapp_purchase.dart';
import 'dart:async';
class SubcsriptionStatus {
static Future<bool> subscriptionStatus(
String sku,
[Duration duration = const Duration(days: 30),
Duration grace = const Duration(days: 0)]) async {
if (Platform.isIOS) {
var history = await FlutterInappPurchase.getPurchaseHistory();
for (var purchase in history) {
Duration difference =
DateTime.now().difference(purchase.transactionDate);
if (difference.inMinutes <= (duration + grace).inMinutes &&
purchase.productId == sku) return true;
}
return false;
} else if (Platform.isAndroid) {
var purchases = await FlutterInappPurchase.getAvailablePurchases();
for (var purchase in purchases) {
if (purchase.productId == sku) return true;
}
return false;
}
throw PlatformException(
code: Platform.operatingSystem, message: "platform not supported");
}
}
Import it where you need to check subscription status and use in Constructor. For example:
class _SubscriptionState extends State<Subscription> {
bool userSubscribed;
_SubscriptionState() {
SubcsriptionStatus.subscriptionStatus(iapId, const Duration(days: 30), const
Duration(days: 0)).then((val) => setState(() {
userSubscribed = val;
}));
}
}
In variable userSubscribed will be the state - true or false.
(Please note you have to add flutter_inapp_purchase to your project).
There's a few ways of doing this, but I would not do this on the mobile device.
On Device like you asked for
Install Flutter Cache Manager, on start set a cache key value 'Subscription' to true with maxAgeCacheObject: Duration (days: 30). On every start check if that key still exists in the cache. If it does then it's still valid otherwise it has expired.
Suggested solution using FirebaseFunction
I would suggest setting up a backend to manage all this. This is not a task for the mobile device. You can have a Cloud Function from firebase where you pass a unique device id and it'll return whether the subscription is still valid or not. A serverless function should work for that. Pseudo steps:
(On Device)When the app starts up generate a guid and make an http post request with your guid.
(Server)In your serverless function save the date the request is made to your db along with the uniqueId that you sent. If your id is already in the DB then check if it's expired (date added - current date) < 30days. Return true or false from the function. True if still valid, false if not valid.
(On Device) When you receive true from your function then save the generated id locally on disk and continue with what you want to do. If it's false then lock the user out or show the subscription that you want to take care of.
Yeah, as to the vulnerabilities, there is one way to take the issue of users changing their time manually just to deceive the app, the solution I thought of is letting the DateTime come from the server this way, whether users change the Date and Time or not you end up with the correct time frame. I hope this helps.
As to checking whether subscription has expired, just follow the step #awaik gave and in addition, you can make request to your api to store the dateTime when the subscription was purchased and when you expect the subscription to expire. I suggest you save the purchase date and expected date in your server rather than on user device as clearing the cache or data directory of the app will lead to loss of the saved data. Goodluck.
How is it possible to remove chartboost banner after in-App purchase ?
use something like this
set bool key isPurchase YES in your NSUserDefaults when you purchase App
if(![userDefaults boolForKey:#"isPurchase"])
{
NSLog(#"Enter add start ");
[[Chartboost sharedChartboost] showInterstitial];
}
[userDefaults synchronize];
}
The easiest way is to save the information in user Defaults as mentioned in above post but this won't be secure because user defaults can easily be accessed by many softwares and one can edit/add your Key unless it is kind of big one and secret OR no body post it as a Hack.
The best thing is to store this information at Server (if you have it) or store this information in Key Chain because it is secured.
How to do that easily with keychain follow below post
iOS: How to store username/password within an app?
Chartboost offers a delegate method -(BOOL) shouldDisplayInterstitial:(NSString*)location
Returning "false" in this method will prevent an ad from showing; remember to return "true" if you do want an ad to show. Just compare against a boolean stored locally to track if they bought the IAP or not.
The reason recommend this method rather than hardcoding is because you might want to leave a few locations specific for cross-promotion campaigns promoting your own apps that will still be able to show ads in the future.
This way when you release a new app you can run a limited promotion and make sure that your most loyal fans who bought the no-ads IAP can still see a cross-promo ad for your new game - a great way to funnel your highest quality users to your new app! If you make the ad art right, they won't even know it's an advertisement and you can make it so they only see it once.
Then you can add showInterstitial:#"cross-promo" wherever you might want to show this and disable all publishing campaigns just for that location. Then, in the future when you have a new app, add a new cross-promotion campaign in that location promoting your new app and EVERYONE will see it - even the people who bought IAP!
an example of this implementation:
-(BOOL) shouldDisplayInterstitial:(NSString*) location {
if(_userBoughtNoAdsIAP && location != #"cross_promo"){
return FALSE;
}
return TRUE;
}
And don't forget to set the [Chartboost sharedChartboost].delegate = self; to make sure the delegate methods function properly!
Full Disclosure: I work for Chartboost