Develop Reference

Flutter IAP subscription

I'm trying to setup a subscription IAP for my app. I have managed to purchase the sub via my app. The next stage is being able to edit the subscription and display details on the subscription via the app. I can't find much details on this here, or in the in_app_purchase documentation.
Does anyone know how to do this, or what the best practices are?
Many thanks.

The Google play billing guide gives a comprehensive guide on how to handle this.
Essentially, let the user edit their subscription via Google Play.
I did this simply using the url_launcher package as follows:
launch("https://play.google.com/store/account/subscriptions")

How do you gift in-app purchases

I am building a website for a client that is promoting an App on Kickstarter. As one of the rewards this client wants to reward sponsors with in-app purchases. I have searched Apple and posted on other forums but I can't find out if this is possible and if it is possible, how it is done.
Thanks.

You need to implement a promo-code dialog inside your app to do that, then send promo-codes to your Kickstarter users.

I don't think It's possible.
Here's the only Google documentation I could find.
You could make the app free for a short period until all backers have their copy and then raise the price but non backers will be able to download it too.
It would be possible however to use the alpha/beta functionality in the Google Play store to release the app to backers who have joined specific circles setup by you. I don't know if Google would have a problem with you using it like this.
It might be possible to distribute the app outside of the Play Store but I suspect that will become a big support problem as users struggle to get the app installed and keep it up to date.

For iOS part we haven't this functionality with Store Kit. This framework was created to securely process payments from users. You don't need to work with payments. Just deliver some product or an extra functionality to user with promo code. Implement a dialogue in your app where user can enter his code, send this code to your server, check it and give an access for user, if code was right. That's all you need. After making the product available, your app needs to make a persistent record of the "purchase" like you do with normal in-app purchases.

How to implement in-app purchase of application Android?

I have created a android application. Subscription is free. However I have put ads inside application. Now I want provide option within app where people can buy ad-free version. And also provide option to restore purchase.
I went through Android docs didn't understand anything. Please provide a good tutorial.

Hey I had worked on InApp Purchase recently and I've successfully integrated in my existing app and ready to make it live. Initially when i had started doing this I've downloaded google InApp Billing Example called "Trivial Drive" from here.
But it didn't help me much as it has lots of issues and bugs, So I've decided do it on my own from scratch using new v3 api which you can find here. This tutorial has clear explanation that would help you and also if you have time, see this youtube video where google employee had explained clearly how to integrate it.
Also if you want quick example, I've a sample app which you can download from here.
The following video also explains how to integrate InApp Purchase. Please go through it.
https://www.youtube.com/watch?v=-h2ESH71hAI
Thank you

Refer this question on SO Implementing In App purchases in Android?. Also for official documentation of The In-app Billing Version 3 API refer this link http://developer.android.com/google/play/billing/api.html

This is how you create In app purchase inside your app.
1) In your developers console, go to your application and create a in app product(Name it as Ad-Free Access or what ever).(Note: to create a in app product you need to have a merchant account).
2) If you have a merchant account ready, create a InApp Product with the type of Subscription(One time or monthly or yearly) and price.
3) Once you have created the InApp product successfully, you can prompt the user to purchase an InApp product by quering a list of in app products in your app and ask user to purchase them.
Here is a link to query the InApp products:
4) Once a user purchase the product, based on the purchase status of the product, you can disable the ads in your app.

The Simple and very easy way to implement in-app through a library anjilab.
Just add the dependecy
implementation 'com.anjlab.android.iab.v3:library:1.0.44'
Add Permission, implement methods and you done.
For any issues you can see here
issues

make android app free for one year then make option to subscribe the app

Followed this but didn't get it. Followed developers page found in app billing option so gone through Google console and android in app billing version 3.0 but there specifying subscription for products, I want to make whole app to subscribe for one year only after one year trial period, and these settings are make only in google console? Or if I need to programmatically implement this?, give me brief idea how to do this.

First of all You Should have Tie up with any one of payment services such as PayPal, Epay, Pay world. Then, only you will make the Subscribe option. Programmatically will give the solution like one scheduler will run for 365 days. After that will go to Subscribe option.
For more please read here.

Google Play Licensing (Subscription Based)

I'm about to complete my android application..
I have a query regarding the application licensing and I want to charge the users on yearly basis (Subscription pattern) for the application.
Is it a possibility that can be done using subscription and In app billing.
Please point me out a working example of the same.

Have a look, gives you complete details here